Malicious PDF — malware analysis report

Static analysis result for SHA-256 88091d584bb649bb…

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 09:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 696472660fb18653b4c7000594ead74d SHA-1: 3b55434e6cdca80039b2b243cfe365f0e29ea2d3 SHA-256: 88091d584bb649bbff90d39f27dad806096f11df4ad4ab9cd6293025326503ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the presence of numerous links on potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/15dcbd88b36c4c390cebed626ebd33e4/noxonarub.pdf In PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/70519366911.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/lifupuzowapuxeralusito.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/596041321.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/vugidujezilokoxivo.pdfIn PDF document text
    • http://sun-tes.ru/files/file/tisobi.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/gunino.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/58085028540.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/79740399187.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/renizufidisov.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/wokojezinopagajaki.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/64825671788.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/1569717999.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/tejedezewob.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/xurevad.pdfIn PDF document text
    • http://prograsifkalip.com/files/45262239220.pdfIn PDF document text
    • http://runhouchem.com/upload/files/gumeb.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/gobikugubob.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/95162574748.pdfIn PDF document text
    • http://parateam.cz/file/92109021646.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/fowizoz.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613affe906af4---vifaxiwufev.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/237e2d2d2f2c7458435db9afc185ff41/mogasite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=prove+the+following+identities+calculatorPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AF 19168 bytes
SHA-256: e4766bfdc7b883535b06d31f476a95a4944795bdcafd70b6b321569be2999128
font_02_sfnt_off000115a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A9 11008 bytes
SHA-256: 3ca87fd9c21683dd32224667ff5999fb82f49b365dc850b1f330edf14d5a20db
font_03_sfnt_off00012f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0A 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105

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