Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2df7b1f05ef40c…

MALICIOUS

PDF

70.1 KB Created: 2021-10-04 11:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e40f9647f9f7c5607d5f194dc8ecea45 SHA-1: d17d4932207cd0409f5121f75b14f22d07a1a54a SHA-256: 7d2df7b1f05ef40c4532ca487052295c82d85a5dbda2c7fd1cb86e34250e6357
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number for a fabricated issue. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content or facilitate social engineering attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://balticstroy.com/uploads/files/tasadanenekopuxaw.pdf In PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/debuminag.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/71305620889.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/fegigulemimefazefefafuta.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/merepitux.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/8635968283.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/70019070688.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-20/20210920002352405120.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/sikazixosusomijozojozixux.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/xavowimofivegiziga.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614c2f0dda88a---xosenaragovoku.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/60491819568.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/nofugozu.pdfIn PDF document text
    • http://root3idlf.holf.cn/cif/data/uploads/img/file/16331933794.pdfIn PDF document text
    • http://fabtur.ru/upload/files/vebixinoje.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/lamusodow.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16156f622983d8---68007272886.pdfIn PDF document text
    • http://capableapp.com/uploads/files/742028944.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/87591894952.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615601b6a9c8d---81180122165.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/luzoluburowar.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/2956227159.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d4e8a8056---97809679578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=swelling+of+foot+icd+10PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3C 15808 bytes
SHA-256: 6d34a583dfc4675e4eb4631b0660f67506b008660d0bf50bfc86c2b13816e243
font_02_sfnt_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 10556 bytes
SHA-256: 0f16262660e03ed1caa77bee2bc9729070c73cf45476dcb9892bcf6d11ab4208

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