Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9058fa6b02d2a3b…

MALICIOUS

PDF

92.8 KB Created: 2021-09-03 03:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e6defc31852cfe57dd5404b7cabc7d0d SHA-1: 93ca1489f44f77e88039f3768532925575f6c3bd SHA-256: b9058fa6b02d2a3bdeb4f1cfedd7f917c75967a086b2544bb7a3afb63b283edf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of link farms on disposable hosting further supports this, as these are often used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160adb6e1c42d0---kajejobisifiv.pdf In PDF document text
    • http://bienchidan.org/uploads/files/51002798202.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/giluwigipowiw.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/bejetodelaver.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/gufud.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/kutapamax.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/31387771440.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/95140121717.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/24438014058.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210702_A5BFCBC6EAE727E0.pdfIn PDF document text
    • http://holzweiss.at/rokinofabo.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/80577325566.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087855f274e7---30807171529.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bff9744cd18---41442444152.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/bomobiwoduluvufus.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fea64c1af9---kusivokoliv.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/lokadotukit.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/kukidosulirimirurugof.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/44237887612.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/lajogilazuluw.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16108503bc8dfc---34874996869.pdfIn PDF document text
    • http://splogservice.ru/content/file/katazojumajew.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc81c8e422---70309946299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ley+general+de+sociedades+mercantiles+mexico+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_off000100f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 11136 bytes
SHA-256: 8b0fd8e04fd103185b85a163ff506b578622e453e14968b6c02dd8a91ef24798
font_01_sfnt_off00011ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC2 19672 bytes
SHA-256: 2658a88f07d478eec9fa662cb0ddcefd577f7902edcf04d0757daec22b5bb257
font_02_sfnt_off00014d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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