Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f229fec4381170…

MALICIOUS

PDF

80.7 KB Created: 2021-06-08 17:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 674d5d43f212d1a4e73dc56f69adf5a3 SHA-1: a4584b0ef98a71c5c2dc2bd1f0fc53c02e06e3b6 SHA-256: 64f229fec4381170e27916b6e65f3b87bb844b0d1810accb705c9de56a0335b3
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and ML classifiers, indicating it's likely a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to various websites, some hosted on compromised WordPress installations. The document body is heavily obfuscated and does not provide clear user-facing content, suggesting its primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cructi.ru/uplcv?utm_term=bts+wallpaper+ultra+hd PDF link annotation
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/405e94d225dd99dab38445a47eec0287/90885104651.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a5a2a01368a41047b59cbe524e0e181f/38544895165.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/9ad6b3e60db2bdbd8bd6f769179285a8/58710215273.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/1206ff023532ad8e3fe1e205f59ffc5c/napijatikavivef.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/gd2e8jus508am3hfahrqsmotqm/27464842446.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/ebvrbtj2bohqb80um0bsm2efmt/wakilufafatujogixibovu.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082f7c833805---22112270335.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/h7c2slb68ove28jiaifae1c16h/fopelupejaxonemun.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607508f98d40e---fexemeze.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/478d8f457171e6bc4839208d5b571df6/pasatekupenifakobata.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5766071e8---89512621178.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/fjr5kui7jkdp7agadigep9c4t3/sedanasafepubis.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/degutirunak.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd65e10815---96117430339.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/86115960233.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d5303983f---wenikuto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off0000f222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 4808 bytes
SHA-256: 35e0909a595d90d39df2bb3775ca644c9a21cd2e7494f313e99bdccec2a244e6
font_01_sfnt_off0001029c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029C 10972 bytes
SHA-256: 8de2faeca156856cdef3bc37335d2c262634db2c712bdb15d384b2e9dcf0ce2d
font_02_sfnt_off000127e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E4 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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