Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5501714f4a6e84…

MALICIOUS

PDF

71.0 KB Created: 2021-06-11 17:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b629d17c42fa88dfe4771a37514eb990 SHA-1: 5312256d8f01c5cec5fb365cd19c622ee38de644 SHA-256: 7f5501714f4a6e84b05ecd2f646eeeacea3587a2389eb59e57ed9c760352411b
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document employs SEO poisoning tactics, presenting itself as a free download for educational material to lure victims. It contains numerous links to external resources, many hosted on compromised WordPress sites or disposable domains, suggesting it serves as a gateway to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://garglob.ru/uplcv?utm_term=cambridge+checkpoint+science+workbook+3+pdf+free+download
    • https://palcev.ru/userfiles/file/72998077792.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/cb5e34a7e5edef6dbf61dac94d71d0fd/72390271892.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa64f90408b---korigefi.pdf
    • http://aylincinarli.com/fckfiles/file/tetawakewimowo.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be0fbaf114---13421282257.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9bcb5d607---48392573402.pdf
    • http://maslatalaia.com/userfiles/file/39375245729.pdf
    • http://okmarin.ru/userfiles/file/52590527186.pdf
    • http://ash-graphy.com/userfiles/file/liputotutafexetuditep.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/nm9btvnggnvatt9jg4g71njmkn/merobode.pdf
    • https://nanyangtextile.com/userfiles/file/43021292052.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/kazes.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c00e9ad7064---vixevawut.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160996b3b602b9---32921366093.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/a0c3219a1bfd5e73e8a43cd70b02da00/13484281984.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160816410f11d1---giferejorufiguf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d3.bin
15b7d27c79b5c7b1a0214722eb8334ed31c553c657f1009bfa871876d491c0ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D3 5936 bytes
font_01_sfnt_off0000ebe5.bin
68b05e25dc3742ff34cda6236c51f87c44205e6ca56fd69e0615fe6af148721f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 10236 bytes

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