Malicious PDF — malware analysis report

Static analysis result for SHA-256 79023f0108bd3626…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 07:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d69b101f5123d9c0e1938b8a2cb8e61d SHA-1: 5fb2c99aa39a445becd6e85928cad95573dddd98 SHA-256: 79023f0108bd36265e31ade3001e31c1c7a49243f274d4b812f3fbafdd35380d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or lead users to phishing sites.

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://queure.ru/uplcv?utm_term=jazz+guitar+notes+pdf
    • http://dralituncer.com/userfiles/file/82427242229.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/xamusaxuxilixemewo.pdf
    • http://coachhouse.info/assets/file/56381981678.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160f9aa35a8594---wodowugavofi.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/obu0iifmotld0jevu4a8to9lec/96726252838.pdf
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/tufilekadajoluboji.pdf
    • http://atreve.eu/ubezpiecz/obrazy/file/bofibojeneliziterapegofa.pdf
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/95447515307.pdf
    • http://mtt-association.fr/upload/file/refeze.pdf
    • http://taskentcompany.com/userfiles/file/61816172612.pdf
    • http://email-database.info/userfiles/file/dovajexezujesevujujowonib.pdf
    • http://cdwy028.com/uploadfile/file/20210620105038.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16119242a6d983---58466891535.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b27365794---tafefupobod.pdf
    • http://school15-tyumen.ru/f/72058047133.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/62qj2m8di9i18ker5jqkumal29/lodagapawofok.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7e55ab78c---50095601081.pdf
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26806985953.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/295b376a00821f8bbe03640e94847802/wodavinelelalamu.pdf
    • http://change4best.ru/upload/file/sitodajixedobusu.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/48780503017.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/b2a8e19cca1f421056157734b267a26c/fogaxibofomuw.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/1rl7i7qt6ol77k1pnv9hnq1j83/sugobat.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e70752c583---fuxozefusabibikolo.pdf
    • http://hakkabrothers.com/userfiles/file///18532889901.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE84 16792 bytes
font_01_sfnt_off0000f69b.bin
b187e5f4e28ea52aacc211606ce75dccb17f05a16bd41f77851dea4539aea403
pdf-font-stream PDF embedded font (sfnt) at offset 0xF69B 10776 bytes
font_02_sfnt_off00010f67.bin
f546df35bb150a93a15e796f5efe0e3eaf292ed5dddc6fe131cebc39fd461561
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F67 16832 bytes