Malicious PDF — malware analysis report

Static analysis result for SHA-256 f173e02de1703893…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 08:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1985ea73e61124995a06b81fbda02523 SHA-1: 49d2fbf5f1e8104518b80664c04ab31ed36fb392 SHA-256: f173e02de17038931916949654ec94b07657de73466cd32510303e5b9465dabd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm hosted on compromised or disposable domains, suggesting it's used to redirect users to malicious content. The presence of embedded URLs, some pointing to compromised CMS uploads, further supports this. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://antwerp-reefer-tournament.be/argt/files/fapudakivivetasef.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16080cface1a65---48358289373.pdf
    • https://almudenafernandez.co/ckfinder/userfiles/Files/91478100342.pdf
    • https://akvaguru.hu/user/file/5776212780.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/769k9lj0723h2v73pn4s0jgsq2/bifebuxuluxigadoravad.pdf
    • http://peaceinsrilanka.lk/userfiles/file/29380410981.pdf
    • http://shopphutungmayphat.com/upload/img/files/57790371683.pdf
    • http://royalgoodviewresort.com/Uploads/file/zodaziwuvedifup.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba89f5306e9---36704382990.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/qnpsqi4265ash61c2ihj9bhk6b/xadate.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/4358a8f63b0a3ed6bd2bc0534efe6946/rirabok.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/rnaveih8h6t318trjjkeh1j8uv/wofajapakevosoten.pdf
    • http://abwingssuffolk1.com/uploads/files/60136759817.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610de1e165b58---11024935940.pdf
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/sasinidozalomadaw.pdf
    • http://eiffelflowersquesnel.com/userfiles/file/kelogazeruridaguroza.pdf
    • http://tuvanthanhlapcongty.biz/upload/ck/files/vorojutozamatibini.pdf
    • http://sjatupornservices.com/file_media/file_image/file/kibidibojawasob.pdf
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/lutexamedogapegoviluv.pdf
    • https://htchninc.com/d/files/dukisitojigipizofat.pdf
    • http://punaide.com/userfiles/files/37937554999.pdf
    • http://hoteldazegliotorino.com/userfiles/files/woxijo.pdf
    • https://glory-aqua.com/userfiles/file/wefenixuxovovilawu.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d42a0bf3773---62854927159.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=peritoneal+dialysis+definition+pdf
    • 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_off0000d6e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E7 16792 bytes
font_01_sfnt_off0000eef9.bin
22b1347438114bc3421f0bfde03c57eb1476c1edc855626076a919591994d26b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 16396 bytes
font_02_sfnt_off00011964.bin
da0c620ee7a642e6cd444a3e6db6b47be24f4e532475510b1942dc76a4c3f861
pdf-font-stream PDF embedded font (sfnt) at offset 0x11964 10608 bytes