Malicious PDF — malware analysis report

Static analysis result for SHA-256 23911fc00d2579d3…

MALICIOUS

PDF

113.5 KB Created: 2021-06-28 13:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 630cc40c16e3dc0a602f1854d7587188 SHA-1: f4e89f53b426e9c1ce11a7b4082f5210245c87c8 SHA-256: 23911fc00d2579d3084e5b478ec5780dcdcb04c67e03b6e1678bcab9acfed596
296 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious intent, including lures for remote support tools and clipboard command execution. The presence of numerous external URIs, some pointing to compromised WordPress sites, suggests a phishing or malware distribution campaign. The ML classifier also flagged this PDF as malicious, supporting the assessment of a phishing or trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://catamma.ru/uplcv?utm_term=how+to+secure+pdf+file+from+copy+paste PDF link annotation
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b80c8bcac91---gebulugurixemawopukokugu.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/9045395518.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608624e47845b---dabamipopirojimo.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098dd4d5dec9---86741664310.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a263b2cf6b5d282bbb67c6f178047236/98261537413.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/24323232090.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/zosonoverewejuva.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b252b692609---dixugabepenovumesodevo.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/nopatese.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/gowadovatasolufolojuvab.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/5447b8e6787ea9e8a619f246f9f305fc/21837781055.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160793996da177---58192620964.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076a20e69e0c---62043281203.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/keninapanagutojubolirixe.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ab6998b54---dodusadebefalefufel.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd92b7b5a0---tefubejizakomemerovesini.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2fa9a400f---21170415197.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/lewuf.pdfIn PDF document text
    • http://iltorg.ru/upload/file/62405607895.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/40962013538.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2882d101de---35066987730.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/zadatevonewel.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c360d21292---sasoka.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/96847450276.pdfPDF link annotation
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/xodoz.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/bidesek.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000140ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000158bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158BF 18288 bytes
SHA-256: 44faf7b913b96d77c263838e67d62b243a9caa364f595cabc4ba87d3e1a7b558
font_02_sfnt_off00018922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18922 16084 bytes
SHA-256: 169060ee3d4a28e10bf8902f35113a35e3026fe70e7561f94e8bfa04626d1e03
font_03_sfnt_off00019e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E4A 10968 bytes
SHA-256: 213d6cbcb8af9a007b6caf0f77a5b1f30d2ac43dfd014a7482bb8afd334c8268

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