Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b9cee828cb7941…

MALICIOUS

PDF

101.0 KB Created: 2021-06-30 16:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 6e7beb47a51717ab306e9de1c0075552 SHA-1: c17e7ee23089b9467fb9aa233905c6e72c2cc67c SHA-256: c3b9cee828cb79417261a9e5606dd427615a2d56761dea4e2edcc8cea02857c7
176 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to compromised websites. Specifically, it employs lures related to browser extension installation and payment redirection, common social engineering tactics. The ML classifier also flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

Heuristics 7

  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a6bd3f01a65820f4e6733fa42769cce4/29403286639.pdf In PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/gma32jgiidc9bf0u7fvadt0bh3/lejox.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/7iojn4d9c5imfg5m0dhucf8hd0/11416835932.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/52553186d1db0c546ef7c66cd8d945b9/56340250892.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760bbd58ced---kazaniputajifonod.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/11020c60edfb2ac50ed57682d8882dfc/senapomugizepel.pdfIn PDF document text
    • http://dhf-china.com/d/files/fujenos.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/psdpouo8r9kqgngfvbnp58p323/wazaves.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/76354923974.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c97ba56c01b---78509011209.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/24566063185.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/kewawilojadegenepefasimum.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077494311e78---pofogaki.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1c9dba0be---pifopijijafijizujuxaziziv.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/83602835244.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608722eb607e9---lerakogusizeluwa.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f342c1fedbf55ed8df5bf8cd3f681f55/terotixubewurasadagal.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afd4ba81798---namigigezagizedupenop.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/af64cff0670aba267cc373d1911d283d/77584532655.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f3e080b36---sanimawakomipalujomakav.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/40108051498.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/n87bct97lqjfppm0nopdffb8v6/ralazili.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/52465872467.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/71115865291.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/k91m82apcpkdpgr9ocmls46rh4/wazowax.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/018181a9f76013139c388f0aedd92775/gugonoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=can+you+split+a+pdf+file+into+separate+pagesPDF link annotation
    • http://irodori.kir.jp/files/file/49891589258.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_off00012595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAC 10920 bytes
SHA-256: 6e919ad323640e06d6233bf997d76b6adcbedb73fc3733a75d8068ffcee02fb0
font_02_sfnt_off000156ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156EE 17264 bytes
SHA-256: af59451b16332e6e42c7283190dc14cef1decaef9eec514bca9421184e70f4ca

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