Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f28bd3511790ec…

MALICIOUS

PDF

100.3 KB Created: 2021-10-22 13:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8669b844fc73e330e8033a2d2b060f7a SHA-1: 04acc5e19e9aa35cff654ae93a5ad072ebce4a04 SHA-256: 98f28bd3511790ec52bb11fe54920ec1d9762995c4bfe3c557e5e93f4c44859d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The document contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of a 'Payment redirection / bank-detail change lure' heuristic strongly indicates a business-email-compromise pattern, aiming to trick recipients into altering payment instructions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://coretry.ru/uplcv?utm_term=intermediate+accounting+chapter+3+test+bank PDF link annotation
    • http://cjmfgxfollow.morefriendship.com/upload/files/57894009197.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/867457185.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/ziponesil.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/54968310522.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/fupodituwalup.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/b3c35f1bdc1fcbcc56a58965a03ceef1/42782590269.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/46666638984.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/tobebenuwokiketelebep.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/70996ed4e351850074e85f753f034a9f/39825987304.pdfIn PDF document text
    • http://szm.hu/userfiles/file/40814902271.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/teniwuwadoxepixeliko.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/92398158241.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149e95717500---lefek.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/fujiv.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/15472928769.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/jiwesusuvakokame.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e7275aa075---perijisunogepagi.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/22816552575.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/voburuwojirojorune.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/kezer.pdfIn PDF document text
    • http://redactron.com/userfiles/file/10411843798.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20211012_B1A53627D1C5665C.pdfIn PDF document text
    • http://turnyras.lt/Files/file/116688879.pdfIn PDF document text
    • http://robedecreateur.com/img/files/pifudabilibanit.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/zirofonige.pdfIn PDF document text
    • https://hgb.se/filer/file/4864953101.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_off00011b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13395 11368 bytes
SHA-256: 3be79d55d6ffd44339c0514df28cbc02a3d7409ed3494c0fb795b36321b90d62
font_02_sfnt_off00014dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC6 19828 bytes
SHA-256: 9c23d4a8001b263dad55770e9c561115d8a9c1dec9290fa15836eac3abd9e93e

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