Malicious PDF — malware analysis report

Static analysis result for SHA-256 077ac0508361a729…

MALICIOUS

PDF

85.9 KB Created: 2021-08-29 09:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cb2fab19dfb2eb06a8ffaa5948c710cb SHA-1: 9b6659e79ad343fd31e7a625359cf46778104402 SHA-256: 077ac0508361a72965b46b29d765112d1b715f6403f2d1ae5da2b4c2dc84b070
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, indicating an attempt to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9163

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://patp1ryb.ru/media/file/85575187974.pdf In PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/faf25174c9b840ff3966f325bbcb255d/51911408289.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/4hlsfbng13239e32mf4o52ink4/13813157313.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/nelidodumavemokuw.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/28313505683.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/95p5a68npjsb6t0cvkm1sb38gr/sobotetovux.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/sijepifamekarupoxamerikeb.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079772c318c2---38565192959.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961ff1b1e80---gugomunenoke.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210701_143436.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/8f78eed46af61a99983cd2990b04fc8c/45491804155.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///47923572125.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/44170338799.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c757eb3ae43ccd8932710102a03cc5ae/6784246784.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/petiwanizikoxomewew.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/31916811088.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/p4hmpaaqeuckqr3q9a9rrirdjm/44420505307.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/vfobk9h2l0lp3761s0169pnq6e/31337159443.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/gorarugalefakexej.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/qui8el0bl0ip08d6ten5tchmh0/10508524934.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080baac54c8f---63685476467.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/e7d67198c6fa2b8c9caf795ad46db607/33301382583.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/90755580932.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac442040085---24884196769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=signals+and+systems+by+dr+sanjay+sharma+pdf+free+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F2 20036 bytes
SHA-256: cb48e98fc6f242704694b825bcf86182a8806d7f882a0d7d005a5f8f9a1c54db