Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c9f8d5fd619bcc…

MALICIOUS

PDF

62.6 KB Created: 2021-08-30 07:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c173bce7c475673e1959bf3598fadb2d SHA-1: e29d8059685792470efdc75f4601e387fda22d78 SHA-256: 12c9f8d5fd619bcc6d85a8f205caed19320686e537961939d63e2665f7c08af6
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7400

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 http://kubkao-kubpla.com/userfiles/files/66037490714.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59d1e06ac5---34798047188.pdf
    • http://nakamurasangyou.jp/app/webroot/uploads/files/54703514348.pdf
    • http://greatnice.club/updatefiles/file/10923382649.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efd9ebdf825---28173261613.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/54500c50d743eac83917c8814d8d52db/xupomonupeg.pdf
    • http://www.anclupnapoli.it/userfiles/file/10873912436.pdf
    • https://vmwarts.com/ecovic/file/larusumimu.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/db559j3la3jgm6uctstukn9e60/lejazakofesavo.pdf
    • http://2ds-creations.fr/userfiles/file/37131534323.pdf
    • http://ghinelliarchitettura.it/userfiles/files/zamemivewegivewujipip.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/1mg2brgitqa7kt4n73eud85rc6/zoniw.pdf
    • http://pnktools-th.org/ckfinder/userfiles/files/kutorokuxefumekixujov.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/39192224ef4cfa12716bae2438a0a4ab/22533459758.pdf
    • http://unsersohn.ch/images/file/vunug.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/f1f580af1059192d2694cd18138e9f2a/65715253254.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160df992442134---fedukabisajeb.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/c647lh7jkeitmv1vblmes19vd9/bubuzo.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/4b8b7f977dc7138f1887496eaca15b60/8314550790.pdf
    • http://argol-editions.fr/userfiles/file/96471369156.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16121a32acd333---90798292430.pdf
    • http://bluecars.pl/userfiles/file/9478126735.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=jetty+bar+and+grille
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c889.bin
94efd755484d13b9e5e4f78cece411ea649252b6e6f6e3237a0b8e4800b42d51
pdf-font-stream PDF embedded font (sfnt) at offset 0xC889 10380 bytes
font_01_sfnt_off0000dfee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 16792 bytes