Malicious PDF — malware analysis report

Static analysis result for SHA-256 406cf2c87f3c3d64…

MALICIOUS

PDF

73.7 KB Created: 2021-06-25 17:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4a638319428d766da34fe3431bdc8b2 SHA-1: 7a52bfe26f114c7fbaa2e3464bd83ce3bc38cb0b SHA-256: 406cf2c87f3c3d640a15e400b1371c26be2780ef94e8e991937ee11e7389b1b2
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised websites, suggesting it's used to redirect users to malicious content. The presence of multiple links on disposable hosting and compromised CMS uploads reinforces its role as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://autotrans911.com/thread/admin/uploads/file/kewezuxopaxerewu.pdf
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/69973934670.pdf
    • http://acecaalcoy.com/userfiles/file/zojetosi.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/9odeb4q499nrgt1bonfmitfos4/84276648423.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/f62ed21540c72d288fbd636e31cd73ea/vewilajomanexajusawuduge.pdf
    • https://robertbah.si/files/file/50069242753.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a7a1ab237---rapodatorefewedam.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/19f0ff1f0a435712cb9f9a41a04468ac/37254931761.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/17530862425.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089a602c38d6---zunetobonevufufez.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba49f68bd9c---85661162878.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/28888389799.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076436e8160d---8497624289.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ors2fa7tttfson08c4uin3d567/35080918406.pdf
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/32664816334.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/kugd3fks9re3k9ohf88gvkqodl/29142259538.pdf
    • https://sasalidayanisma.org/uploads/file/mumiz.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160929042bc2c0---zakadotone.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=chicken+and+eggplant+parmesan+recipe
    • 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_off0000bf25.bin
1de612bf22402d2677f504bf139657b3c8b407384d27638f73628faefcef13cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF25 16136 bytes
font_01_sfnt_off0000e8cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CD 16792 bytes
font_02_sfnt_off000100e4.bin
b624d92cb6398994651ebc042e26df53b6ab4e3ffcd7dc1c4c11de138a5222c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 10964 bytes