Malicious PDF — malware analysis report

Static analysis result for SHA-256 33147aeb9270d4d0…

MALICIOUS

PDF

78.6 KB Created: 2021-06-17 13:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f2e985d0efeb104ba5d32a21ff9b1ea0 SHA-1: ed9b5567b9e17e54b4d3b9ed07cb123134f70405 SHA-256: 33147aeb9270d4d0e80734e07818adadca6022bad3b30c43171e12331c443f71
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and contains no readable text to infer a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebc85e562f---zinezutaxenakigetowip.pdf In PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fb64413b3---letazufukesodexelilup.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607b36dd50bea---87111404174.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/ed9a44eed964be5b0d73fbe502411ee8/62440718934.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/23f4e6c7a400b1c034989321f056a551/tebalujuxalosato.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/6c77kcts8eicvtf54ebrre6676/bebefivewolojid.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089796c8e7eb---famufikavifijumojazixu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609063f18131d---38291668266.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/e7b1a890d361c37aa8ef94eb51ee394c/kemasafuxuvi.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851458eb811---74705606766.pdfIn PDF document text
    • http://bjjiffy.com/upload/xobudavafinisodesotemi.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/zumukigesoxisinisekavo.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/de580ae5601d09f7710f081c926f6621/kotixagugezetonafoviluwem.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607223b4a3a7f---sipawebemovuk.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b03d4800d5---89155865009.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/kupunimexisusades.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/19555979624.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=capsule+hotel+animePDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2050dad11bb516ef70cbde713f0ff9e4/wirewidubivirixusibe.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD936 9116 bytes
SHA-256: eb8191f9fe1e8ae1aaf4eac711e23c4a0b2f7cd8c369c55bc48e04e97c8a1207
font_01_sfnt_off0000f7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 4868 bytes
SHA-256: 0e4b5dde4ab5b351129eaf3dd4d1e12e063e5d00b1d2f060a717cddb24dca898
font_02_sfnt_off00010816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10816 11444 bytes
SHA-256: 19f611ba1615803c63c1ed5ae7f0d6f549048bbe44c418b2b48e804297006795

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