Malicious PDF — malware analysis report

Static analysis result for SHA-256 eecdbce6c0e01693…

MALICIOUS

PDF

78.0 KB Created: 2021-06-11 20:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af1d8bbd38f5df17159aaf4d5902a8e7 SHA-1: 402241531d33ea2d8033216c90f3004b5a3dcd4b SHA-256: eecdbce6c0e016933c4923d7f84894c80b82b08b5a2008a6376119617887453b
196 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous links to compromised WordPress sites, suggesting an attempt to host malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the presence of external URIs and the overall structure point towards a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pistant.ru/uplcv?utm_term=three+phase+motor+control+circuit+diagram
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5551145e1---nikedubu.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c367162ceae6dfe2a24364aa8bb94407/50447034382.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9def64740c---70276963623.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/6cq9gotvs0ls8b9fpqr45ehnhq/83290236161.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160949fcf729c8---15842917813.pdf
    • http://zgkimsteszew.pl/img/upload/files/mozusadenigegoxok.pdf
    • http://sillajen.com/fckeditor/_upload/file/82468423321.pdf
    • http://bluecars.pl/userfiles/file/belovu.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/hjf1se55hn9e0i6n2nv6ko74mm/lolavoduxoxa.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/986d7bcd5edd7ee77b0d1d5152d75a46/dujavufekatopoweze.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160853df0bd27b---tanuteramipewanoxomut.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e4ef99fc2---vosixutozowuwudekujaduvad.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68ccbfc53---tatibumaxipez.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc00c721352---pifuzum.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_off0000f643.bin
4fb62d156cd69afe064c68201bf107930c2834153e2af6ddba0de2ebeba48df2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF643 5436 bytes
font_01_sfnt_off00010891.bin
195b2b99138a87aecbdef72065e3446ddfc7c066a1a41f0dfaffddd9dcf11234		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10891 10168 bytes

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