Malicious PDF — malware analysis report

Static analysis result for SHA-256 8585f7fa854e4c00…

MALICIOUS

PDF

69.7 KB Created: 2021-09-29 03:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: be1f637defff19110289023d790c1e40 SHA-1: 8ac505a53c9cb477a3530c6d806b22b0be676edb SHA-256: 8585f7fa854e4c0047e0004d04d77c0b9b504b66ae41e29faa5bc73a44716c7d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish for credentials. The presence of external URIs and the nature of the heuristics indicate a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/2ba9b5287ddd6503812c9e745b1470b3/powipebexalekunazewupe.pdf In PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613672056df6b---66331569331.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/9748546165.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/50222885228.pdfIn PDF document text
    • http://rinsacars.com/files/others/nuxomewidiregebaju.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/4002848312.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210912152959.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/ferir.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cbcc227f4---71366633737.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/96056817514.pdfIn PDF document text
    • http://sial.pl/galeria/file/parilolilujise.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/tesexak.pdfIn PDF document text
    • http://pasted-radio.de/web/files/22708122331.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/pukil.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/kotefapekufata.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/moluxujirokuvuvulisavam.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/4jjt2k44sktevjmnq7het4nvpb/nuxudiwonexulivokobiveti.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/fojafawaweduwowo.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/pevidonuxokivurazuzu.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/guxinuwosoraguta.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/benunifujipolusebam.pdfIn PDF document text
    • http://robbes.nl/media/files/6076037488.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/fabizonitux.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614547bc2177c---25657625513.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/givetefetibomosoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=gta+v+apk+obb+highly+compressedPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B1 14860 bytes
SHA-256: 56a153a76afa4b48b3fd66d816f3e84aa5fddf19459485f04c087811621a6c66
font_02_sfnt_off0000ef1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1F 11308 bytes
SHA-256: 3a474c8fb97950c345e9c636c5cddbf0874e0d62709dc186bf7f9cb387d0f4d4