Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9530525bbd631a…

MALICIOUS

PDF

68.2 KB Created: 2021-04-29 18:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9dccf71b6e71d4e2e143c243c529df1 SHA-1: 2759e6e287c767f3ee5cf281a7798a06b7cbc4aa SHA-256: 4c9530525bbd631a062984b271879f60540f3a3cbc03e3ca95aab706007489b3
156 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata related to its creation and a deceptive title, reinforcing the phishing lure.

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/39082edd03456333159405c851d950db/tizawezanurexopu.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/b2796ce43ea4c5bd4709aa2d66dfd967/19605277026.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/u397j38s2dad32o7n427348a6p/velatavagigomix.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842f1d8c8a6---53389715214.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160701688a3fdf---napibemomig.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/cdce5c221242caeb50c8e6b7531892d8/50702713354.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4547b3424cdc0ba38916a7961216a5b4/81196793582.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca2630b785---wilegalakagenoline.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/5e5ee81f8deb7839873efbc507ace7b3/xikesekakubimiki.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/a5808d3e8917a2462c5e498c50458991/vepopu.pdf
    • https://anfauglir.com/images/file/jikuwujikida.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160880188e0630---bogebexonurerekejuw.pdf
    • https://alianzatours.com/imagenes/file/87561893187.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e2ce53636---46049614827.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815a8e52382---20321104623.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160829aa98c9ac---24620831238.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=imagine+dragons+believer+piano+notes+pdf
    • 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_off0000cc9d.bin
2dc9fe1bbaa642d7dbedd8a1a850289bfd9faddd122d712cb3ec7705ed9f4c34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9D 5496 bytes
font_01_sfnt_off0000df36.bin
4d1aab3fd2c2f60d757528d8a208ffd852e0e5090692d468990c419ab6212cb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 10768 bytes

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