Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc33f327eff0cd7a…

MALICIOUS

PDF

65.6 KB Created: 2021-06-15 23:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b85caabaf77fde166717712e77ad6c23 SHA-1: 958cc941228215ade7a74bec5c2375b729622eae SHA-256: fc33f327eff0cd7a31c5d915310e90f8bfb4cf6b2a783bab53319e93683da621
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7711

Heuristics 5

  • 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
  • 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://krisoc.ru/uplcv?utm_term=applied+fluid+mechanics+7th+edition+solutions PDF link annotation
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/13838b6257586712b7e3fafd4894a8ac/domanibitigonawun.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afc3c347c6b---9410854862.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983d345acb8---74875874468.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607804f5eba8d---13346429414.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095eae206792---vofabujuz.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/lapitifetelazu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b3a5d1d46---wijuwawoxixamozudix.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/35210808657.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/nekawujigelebozojojati.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd96993d95---81408865843.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a60ceb8bf2f---vivenirarutoluvu.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/d045f485511f02497364c292052a7246/89151577517.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/pozelarugabituzadevumo.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/sexevod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC964 5248 bytes
SHA-256: 6edc31278b0dfd45d801e891c50ea9f2b013f3793c14c1a40c6244c13df0c729
font_01_sfnt_off0000db1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1C 10756 bytes
SHA-256: 4f2450b0a62101d655fc600198717318185a6d6ff8e6b633947b1131067b33ac

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