Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3113df31c2e358e…

MALICIOUS

PDF

62.5 KB Created: 2021-09-06 16:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9bc3430d5d1bb6e14a6e56ca4d9c916e SHA-1: 0efe5724d0b7764de8bd187ecab44852d78540be SHA-256: a3113df31c2e358e2b63f8ede206450aec0492a09e7889f4db3d7175327570b0
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users into downloading further malware or submitting sensitive information. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9142

Heuristics 5

  • 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
  • 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://nazrabilisim.com/calisma2/files/uploads/tiriwazikom.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c73df80f315---69043830001.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9dc669653---8405503818.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/6u677p1gbf0rubsoieml51vjvd/36240696949.pdf
    • http://www.hydro-tg.pro/upload/file/papemuwugidojidajafo.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f40be4b57---82823191515.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075b02d8d182---mepunifawuwovabojokador.pdf
    • https://birotex.rs/images/files/2421747897.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124a75d79ae7---36098292287.pdf
    • https://lanhcongnghiepthinhphat.com/upload/files/bukedike.pdf
    • https://sonntag-immobilien.lu/userfiles/files/seguzadopa.pdf
    • http://auto-spec.ca/fck/file/81612275514.pdf
    • https://blugarden.eu/file/zagudilatezesulifufal.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab730e5ce8f---zesabomo.pdf
    • https://abcoegypt.com/userfiles/files/14211193420.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608764d3abeb7---36415114334.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bc6173515---12673651155.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/xononozadax.pdf
    • https://tonymusic.se/UserFiles/files/25411371730.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073209f18298---kugidenar.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/f4iph3kfpf035q7qg7rbiilvqs/maravagowavam.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/7d7524cf9a9707f15a1202a65d6b3798/99185355466.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609253e543f9b---tegasufuz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ieee+802.1+pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8A 16792 bytes

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