Malicious PDF — malware analysis report

Static analysis result for SHA-256 643d146ee3c90985…

MALICIOUS

PDF

71.2 KB Created: 2021-07-24 00:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f65e053d68bddc6fdc66bfd8a12a32d SHA-1: 3527ce70735c21f3c16c6cbe6c0d8585b3aea226 SHA-256: 643d146ee3c90985a533fb6bf7b9e3480ce61354303fc6cd13ff82f701009da3
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://muzeumostrowiec.pl/obrazy/file/jexuxoximajaboma.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/8d3a5feed1466571392b3907898a9fd5/1426724145.pdf
    • https://ferdavagnar.is/images/fck/file/7637900253.pdf
    • https://ludifrance.fr/userfiles/file/69338371328.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/regako.pdf
    • http://utuin.net/files/fckeditor/file/kelexemufaduva.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2ae3b8884e---bimatumebenozoluzuxu.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57a0cd8cfb---xubul.pdf
    • http://sparkpro.lv/content/file/sabawirokadefava.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/26313488d31c8513693bc10b2813a7f1/99851164760.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/rt4f9pdb5oodsd96fgbb28h6nc/bitawepokejibedenu.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b5d0a70f9---dixiwafiguwar.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9c285aec---dibukaxidid.pdf
    • http://dermalab.pl/userfiles/file/ruvejodawom.pdf
    • https://artbynela.com/uploads/file/25782408558.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/90997408386cb396c52061859f335d32/25759638213.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbe466f7ff---64883754059.pdf
    • http://curry-box-deluxe.de/userfiles/file/47730239744.pdf
    • https://kuzeyilac.com/resimler/files/56066254109.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/f9pb20dkelft9332gukdo1vk4u/63525154775.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ffd90cf15---lawadudenusap.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093a29cc11e8---xexunemudasuwugalapejipe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hootoo+powerline+adapter+instructions
    • 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_off0000f312.bin
03b930a5f3bc7d285a83a98ce5b200f6a2f60decfbff102f2b60bd0723ab1c29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF312 18372 bytes

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