Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c20ea69dbd4fa74…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 09:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3e05dcf01ad472c0e374a59f9224c86 SHA-1: ec28d3161f007adaf25e80adb3ac624964de235e SHA-256: 2c20ea69dbd4fa74a48efba662fe4be8dbbc24973dedc8984b35d855a0c050f2
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to initiate malicious actions. The presence of heuristics like 'SE_PASSWORD_ARCHIVE_LURE' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the document is designed to trick users into downloading further malicious content, possibly by providing a password to decrypt an archive. The embedded JavaScript and numerous external links, some pointing to potentially compromised or disposable hosting, support this phishing and malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://anne-berger.de/sites/anne-berger.de/files/fkcfile/36978531498.pdf In PDF document text
    • http://www.heksan.com.pl/file/voridufaritaminukiba.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/11381956274.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/20504394179.pdfPDF link annotation
    • https://lotteppta.com/beta/assets/file/6841360293.pdfIn PDF document text
    • http://taociren.com/upload/file/2109071348487907518irkcw5zh8kp.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613337b5290f7---felozokuvorow.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/26982373421.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/5344690504.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c723be7117---pasolu.pdfIn PDF document text
    • https://theurbanthinktank.com/files/48823200340.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/24346553293.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/jarukalitatovizetaxixuvi.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/65283508432.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/rexujimorozaxiruw.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/vugidixozu.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/43406273555.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a66d218877---luduzuzo.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/94713246003.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/qduefiih4v1r8dj25b10g72ob2/vitisexivefavofodawo.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/41127612435.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/16695149938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=adobe+after+effect+download+full+crackPDF 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_off0000d31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB32 10608 bytes
SHA-256: e18f418f13e64492319f92692cde7ff97338106eb26f8aa75cdd8959e75f4c94
font_02_sfnt_off000103aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 19632 bytes
SHA-256: 7ee040791c8f769354a0e0d7f8c0bcaf7cc87a4b77c9f721804039e6030514a9

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