Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd6cc4c4137a8156…

MALICIOUS

PDF

72.6 KB Created: 2021-06-09 00:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11713fdee5c4fb1237e5078f64720dee SHA-1: 7ac8cd8d33ddf3c8d53c7898cdaec1b893402acf SHA-256: fd6cc4c4137a81568ddbb8414e015d86f7d6e27a2c9ff95a937874809ee143f3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final malicious destination through multiple redirects and compromised infrastructure.

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://catamma.ru/uplcv?utm_term=network+communication+protocols+map+pdf
    • https://accesoriosalmayor.com/images/userfiles/file/nopet.pdf
    • http://datev.hu/ckfinder/userfiles/files/42232353387.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607397585b0ca---90037867731.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/l4c94gngrvov7pc28eb4jgfl0m/gabawexuluruw.pdf
    • http://alpha-th.com/userfiles/file/ludumibolefasilafite.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/68724750895.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a62c2139---98040420207.pdf
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/5bub68c9j1vvanee6khrbj5gnn/zupudirenujuneno.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a2a94beae837c67f9480be9a11da557a/jekemijujikir.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a129369c5---19628454968.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/vl9k3v2udtcp48l9lf77btj846/90029000898.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16084b64eba1c9---13741896643.pdf
    • https://chezgregoire.fr/userfiles/xolalofefudijufapurof.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/96237e7967692e2c301848784ab7e80f/pogixakid.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_off0000df77.bin
fffaa6a9faee437c718238f9c2528acf3a97c7557dda3e69e454a52c399dae43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF77 5424 bytes
font_01_sfnt_off0000f1ed.bin
117609cfb5c8fd8de42f6860413e8f8a239784232736a65204771ef11ce6aa45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 10224 bytes

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