Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fa5322860c6c0e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-01 05:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bb58bedb6e4b446321565d01c368c2c0 SHA-1: ffa8b7a071e4efa65c3ec6ba123842dd990a843e SHA-256: b5fa5322860c6c0eed58ff1c2c9fb2f0734059edf0772fcbf642fabbbf4d2bae
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.001 PowerShell T1553.005 Security Software Installation

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The document contains instructions to disable security software and execute commands via copy-pasting into a shell, a common lure for downloading and executing second-stage payloads. Numerous URLs were extracted, many hosted on compromised or disposable domains, suggesting a link farm or distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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 http://pileshoppen.dk/userfiles/file/nufometudit.pdf In PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/96107848666.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/dumus.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/93ce46cd98317bf22bc6dafeec3f306a/4533153085.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/foranotudukodukol.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/55515186051.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/64d95cdb8b98c47dc52d6e044d38f52d/ximeluvixo.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982b93ec9d4---89496917144.pdfIn PDF document text
    • https://loctra.net/userfiles/file/dajoziwigajaxijono.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/buzakokamuxazakipegokumir.pdfIn PDF document text
    • https://badoza.net/userfiles/file/gusor.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/45038260752.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd6f5bcce5---4167136002.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/mdq5a5oq1o45qjt52fkt1qk8db/wobogokufosigol.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/80692757247.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/3f5cc47039faaa75ad6053fa8c5b8a84/44534129040.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/zezuzuguluwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=shortcut+to+lock+computerPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 18568 bytes
SHA-256: bca9465adf981b850899cf77781a014f1326107f49b58a77426ebbd31327b10f
font_02_sfnt_off00011b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B71 10380 bytes
SHA-256: 0f0370630a8db22342d64ed9af8836a80cd142dd32272c2a565f4b016297497c

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