Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04b0fcd72824f5f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-10 10:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a36834559c5ad26679fbf7d270300d3d SHA-1: 8cc3cbd4ae231f05f8009eed55f9ef0520388b04 SHA-256: e04b0fcd72824f5f8bc8a290cb256fc792950f45202f661a7381ae7154e1f93f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern. No scripts were extracted, but the overall structure and heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=mobile+gta+5+game PDF link annotation
    • http://dalboncostruzioni.it/userfiles/files/telidesaki.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/falurifulutewepaxarapoxo.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/75439163885.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/patixi.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/vagupesajivaniwufimabil.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/zilolomotak.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/kujabaxemasikivivozin.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210910_6B9D9C7AFB02B12D.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/gajetuzonuwinifozivavukiz.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/72589815419.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/91333763843.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210903230919.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/winejejamujufokepuju.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/wadoruwimekajuvagax.pdfIn PDF document text
    • https://labelmarket.eu/data/file/tovamafidaxejupafelapora.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/saronagipufudirale.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/donaxoworaxinegobakixix.pdfIn PDF document text
    • https://highrise.pl/file/dumebewa.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/e0eb065282b1c1bec2a707cbfbe84ce8/zezezidi.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a140fae592---24095858532.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/10583306573.pdfIn PDF document text
    • http://yjccnc.com/upload/files/gikexinobedowawalalexevo.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/720nlkq7j34ouoo2cnol7l3j63/92458855629.pdfIn 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://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_off0000e1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BD 17752 bytes
SHA-256: d9caeadaf44350bd3f3794410fe0d53dccb01df7225a78762dd5423def62c36d
font_01_sfnt_off00010ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFA 10344 bytes
SHA-256: c04a22350f4d7693fad559ef0a39b35e10731f81ca8eba45862ccfb53587f7f3
font_02_sfnt_off0001276c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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