Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e2b776c28d018f…

MALICIOUS

PDF

83.4 KB Created: 2021-08-25 06:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 77ecd824a98c281a888cd23ed258e30e SHA-1: 1ce5f21084d761767e169e8a3bf46f383a130190 SHA-256: b1e2b776c28d018f7a78eaa825d69998cf12508236ed076406e61f6abd69df6d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to numerous external URLs, many of which are hosted on domains that appear to be compromised or disposable. The presence of these links suggests an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kabelkyaobuv.sk/editor_uploads/files/nidagiziz.pdf In PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a77d2d5d6e---43872624218.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/napenojodibasufowu.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/97320024582.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/88280890102.pdfIn PDF document text
    • http://consade.com/userfiles/file/kekudumabil.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/f5c0d2821cac86a1bdae419bd05d673d/57081198544.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/qsqud2s2l0lenjf6fuoodov630/rodigoretajavavekiva.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/bb12ec01f47aaf4fbfc1550362ce50df/65634519122.pdfIn PDF document text
    • http://humanlitech.com/files/files/75203802179.pdfIn PDF document text
    • http://elitvorota.ru/f/file/62297293415.pdfIn PDF document text
    • http://foodchemsino.com/d/files/19577175588.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/96696158366.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/llme3spjsqv8vhfjdk30mdqr90/86595714679.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f47f7d5e05f---jukuvovunaraxus.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210714_E459621E035F5CAC.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/punojofowabaxafi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607c39a98b2e7---13468216704.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/salufedaw.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/zuvojetojirixedibepupod.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/94749105423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+say+uncle+in+sign+languagePDF 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_off0000e1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FF 17332 bytes
SHA-256: d4669014816caa2ec5f19bf35c12c631ba3b49ad0121ece570d319a12724034c
font_01_sfnt_off00010f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F72 10596 bytes
SHA-256: 06cc50eed271b39fbf8f49700bbf50936dd15eedc70ea9c1febba79250f9409a
font_02_sfnt_off000127db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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