Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e769147fa38a8e0…

MALICIOUS

PDF

76.1 KB Created: 2021-06-11 11:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a468530706383c1c4acffc1537d56b5 SHA-1: 67009600b92b6f63210498624dbee9156288a2d7 SHA-256: 0e769147fa38a8e0c08dc6b24af03521fd1c879f2b11bdbd1627f45a22cbb58d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many hosted on compromised WordPress sites, suggest a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to serve as a 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://irlanc.ru/uplcv?utm_term=human+male+body+drawing
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087374961634---91771318448.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730ef8962dd---39144406362.pdf
    • https://anmoul.com/userfiles/file/rudodivuzo.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/m0kvencfb3r87uei260mmh00sn/71639669243.pdf
    • https://terminal.hr/userfiles/file/84660551838.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6c36b48cb8f3ba1796b62e6c55010967/95447308083.pdf
    • http://inlygiaylynhua.com/upload/files/xavixukumib.pdf
    • http://aarogyamedico.com/userfiles/file/faginalevi.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/587db650e7c10f93dd46dae81fc43a81/32255706813.pdf
    • https://abhimaninteriors.com/ckfinder/userfiles/files/kedapoxu.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a884553ac2a---kavepujetuvugisa.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/bb39cdb02c295f87631d38a2c3522dd8/rubevoxo.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb5a922709---68620610574.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16074a44388f97---baselinud.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4dea82ae7---34985685518.pdf
    • http://pileshoppen.dk/userfiles/file/fisavusufoli.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_off0000ecd0.bin
c3655721f9272deb10b12acb6ac33fc57ec3e1c0b58f36d48c703ca57299c159		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECD0 5260 bytes
font_01_sfnt_off0000feac.bin
6e7d41d2a3c387acc84ad0ce13adac5cda53fd1b988c2ff1e61df19b6e49d7ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAC 10808 bytes

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