Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7c823d48957d69…

MALICIOUS

PDF

76.1 KB Created: 2021-06-12 10:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f08090def038235fab9f66df73b63d6b SHA-1: cc1b7506efd8e7c4239cab19dd482128b955d15d SHA-256: ac7c823d48957d69056adb0280fe526c7ec1bfd07dc1fd7cc3954f7b91041ab5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish users. The document body, though heavily obfuscated, contains keywords related to 'free material' and software names, likely serving as a lure.

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://allytemp.ru/uplcv?utm_term=free+material+substance+painter PDF link annotation
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608014235d728---xamodupiwirapulelabo.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/d61f3bffcedc0ec21389a7b20fc29e68/17582649666.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/bisegozezeguvuvedokaseme.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16090c9b9ec4e5---kenuvetikew.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/61937066384.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-12/20210512173726318719.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609552c173a36---58908592688.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/84513094450.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/2ff9d09c8e9e279de4d728a076bd6325/26302721346.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/fe6f9d36d42ac760df24bffcfd256fd0/kanoraw.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/31064946462.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/55824510154.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/30113140543.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000eb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB37 5176 bytes
SHA-256: 2316ac8b7e6dd50550124b60c05533c2c6b39491c241941de63f9c84fa8e9051
font_01_sfnt_off0000fcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 11780 bytes
SHA-256: 8047e96fa77c0992852826bade4c0e4360a48d552f0d63bb54e3abe0335b180b

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