Malicious PDF — malware analysis report

Static analysis result for SHA-256 82702370e519239e…

MALICIOUS

PDF

86.0 KB Created: 2021-09-04 05:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9f82f786443cde1673079418ba8634d0 SHA-1: 56dfd0a18c025a68c693985b762c30ccac78237a SHA-256: 82702370e519239e5916150e90dc07076190df150975efa6787d88399319af9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of external links and high detection scores point to a phishing or malicious redirection scheme.

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 http://meyanko.com/userfiles/file///rikep.pdf In PDF document text
    • http://spreewaldatelier.de/img/editor/file/vefik.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/6h5tpurv8s9n7jpk014djn1ui4/medosikupodujawujuv.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/tebamezebajupilevafoze.pdfIn PDF document text
    • https://rajaunited.com/contents//files/7630652296.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/wemebepesejefijujepete.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607960c2ea3f4---widex.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/sotipigujubakevufezimebi.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/3k3k12sl51h403u4n2lm177nog/buzoxevuma.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/0274cb0c3692c367e810ccb1ff389c23/bigegotexawod.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/brpv25gog1f6pbdm0dofupmrs6/bivanademodosukizozapebi.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/22f51c265beff208b9f99663324e1a03/59869522196.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/vasuva.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ns1kagn47g7k7ai85ucohd05cl/81460480742.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/mipenujaxajonilakaviwipa.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/96484890184.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/64943692876.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160d82176c7d82---45331388680.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a959dad2a2f---8279625795.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/xukevabalafawikefi.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/ditavisegilagof.pdfIn PDF document text
    • http://vhshf.de/File/peladelegiveful.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/jiberuvigiruvaku.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/1387e975de143bc04f2aa6bb1a715cd8/20631172497.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/37f23aq332rlug8lmseoli02sv/58478856887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=dermatitis+herpetiforme+tratamiento+pdfPDF 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_off0000ec75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001048c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048C 10720 bytes
SHA-256: 9e9532c3dc9b56b97ef1fc580d65f868668e6092f5c3a74d87ab01957989c834
font_02_sfnt_off00011cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF3 17408 bytes
SHA-256: 4fc1ae0c8cbf7ae563e5fd4b49e323f86d2e2450de8b8d0db8e3a74b9815e23f

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