Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e8f611b9a8ef50…

MALICIOUS

PDF

75.6 KB Created: 2021-06-16 00:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 9b43903c425d03b32070b75ebfd32c46 SHA-1: f6d5e507b4a878460f703d15440f9abd990ee80b SHA-256: a3e8f611b9a8ef50060b7369ba41ec79fbdd20c40a673eac10dea856660adb76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, and the presence of embedded URLs points towards the document's role in directing users to malicious content. No scripts were extracted, but the overall structure and URL analysis suggest a phishing or malware delivery attempt.

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://coretry.ru/uplcv?utm_term=free+ios+spoofer PDF link annotation
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/obon9r4golp7cdsa2uf9acapn4/topogobutup.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/69182647461.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/85c3061fbca0cb04f660041508ae34ea/birazunozefaza.pdfIn PDF document text
    • https://mattress-leader.com/media/jobovas.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/d84e33a81b07a9f920c7d3f76cb7cf3f/89110573105.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/rarigorijunujifupofoximad.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/15760380957.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/81337822038.pdfIn PDF document text
    • http://rosycaffe.com/file/mepomixiwevobofegagudej.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/suruvozajodejaxipolikovuk.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/07723df795e056b33336e7f0100c24b8/guvusetivodod.pdfIn PDF document text
    • https://agatanorek.com/files/file/95779081109.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac9869115b9---3670970250.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b626844dad9b41f0a05c78c0fb09a532/bidoji.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/ff172e9c42cba24e1a72dba520b6765f/lurulejinusogenotovoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 4608 bytes
SHA-256: 49b65df2215e1d9140cd4497f488caf361c927853cd96fdbc2706d9cab8d0b31
font_01_sfnt_off0000fdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD0 10532 bytes
SHA-256: ea31588a49efa2ad9e12d283138e3f2b0b6d366687b83938c80378fb55287c5f

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