Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a3999c3670d4b6…

MALICIOUS

PDF

89.5 KB Created: 2021-08-04 20:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a5afdc93ae955cd7622fcb6f421ff296 SHA-1: f34adf1b18c0bba45c927dde08d43f7fab85e53c SHA-256: 31a3999c3670d4b6d185feb1995b752b2553871586ed33868669f16300eb1c9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple external URLs, including one on 'drafthe.ru' which appears to be a redirector. The presence of numerous links to compromised WordPress sites suggests an attempt to distribute further malicious content or conduct phishing operations. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=mhw+meowlotov+cocktail+guide PDF link annotation
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a25950857e40f4ed83ce0823e6ed82d8/55534342791.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/9806ba7209b714a040ab43f97601071d/fofutilokavikugupepupite.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/gifonikulotonunati.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/abb5e7e58c8be32eddfb64c6e490a37f/mewujosisafisuvajizefed.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/579b33a14b9761f2c41886694e908823/42046978204.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/59388777474.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083644401ee3---rebewevividosav.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/38780933570.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094568a2f57f---sezudivefiterabofezelu.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce84b175e9---zafupezomu.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607217ae342ae---55835053164.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/pawapobugemapamilemazo.pdfIn PDF document text
    • https://troypin.com/calisma2/files/uploads/67843488920.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b67368929e---terorixetaravotunuwunif.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/rejuwuxaw.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/772a042a808156968609a8cd056aa355/59206931396.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eda02a4bf8---joxujeribi.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/vedogazubadam.pdfIn PDF document text
    • http://thompsonhigh1980.com/clients/4/48/48b9e10b24f1ac3c627dfd5bb8c45987/File/pokogitefivugupav.pdfIn PDF document text
    • https://luminex.pl/upload/file/jitesezutotaregep.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/manazujizav.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5858f1552---wupega.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/80477374254.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A7 10784 bytes
SHA-256: ac04a2fe9cdbe9e4b1372cd42d0faa231da5e83bfd66054f7afad786c21571f6
font_02_sfnt_off00012b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B56 17176 bytes
SHA-256: fb932b42a16914d9c56917f97c8ce4b9d3b4b287d080a466d85fe8e24c879291

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