Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d10f3b23ac79798…

MALICIOUS

PDF

76.0 KB Created: 2021-07-02 15:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 097297e9aceccf8d7266c0657c3769c0 SHA-1: 034735479d7b1a052032d56c9dae2e909010cf8a SHA-256: 3d10f3b23ac79798333f4b950ae069b246c2a59e15b9f337abe8b44899e3bbfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://coretry.ru/uplcv?utm_term=if+there+are+4+quarts+in+a+gallon+how+many+quarts+are+there+in+50+gallons
    • http://pensionpoint.cz/userfiles/files/46667186907.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa18ae1a8e8---1907186233.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a465b2db0---72140195791.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085159fc1659---46013309692.pdf
    • http://jshtextile.com/UserFiles/file///25306222784.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/631e6155aa025654f1522d595b27d4f9/51665863296.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/66adfb644e048c0f8d34724252e4f7bb/kegar.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/659f02e4816bd7d2e3b8007988bbef08/tufarelujegulabugix.pdf
    • https://churchofgodinjamaica.org/app/webroot/files/68448817762.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57ce7c2f4e---43321411244.pdf
    • https://htlexpress.com/ckfinder/userfiles/files/98340845900.pdf
    • https://travelworld.ro/userfiles/file/likekipetew.pdf
    • https://mebelihome.ru/upload_picture/rexibifokegosurasunibaliv.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079928fbfca8---jefurudito.pdf
    • https://sieuthigo.vn/upload/ck/files/34005376794.pdf
    • http://conblocmanado.com/pics/file/bufodapufoposinosagokogo.pdf
    • http://shuswapladystriders.ca/userfiles/file/89724488230.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/idhvo3lu0lc63nungbv904bv21/58011055017.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/121560798160940d8f1ceaf.pdf
    • https://kvkumariajnkvv.org/singhania/downloads/file/14676151066.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/dec48a918d84555fdaf2a594eef1ac99/7861741616.pdf
    • http://mazdooradda.com/userfiles/file/9718286608.pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c3321a0cbc681d510bf6754f85e8a4d4/naromojupalonujezojo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c45c.bin
7f12a308689f814f067bbf614d75ad7b572a860e838ee150a87eaa161e695a11
pdf-font-stream PDF embedded font (sfnt) at offset 0xC45C 16740 bytes
font_01_sfnt_off0000ef43.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 16792 bytes
font_02_sfnt_off0001075a.bin
4c6d855286dc295cca886ba4d5ef2b7d1c97a8a6eb5764dd60ddb9046b2a9c0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1075A 11392 bytes