Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6181731db502d2…

MALICIOUS

PDF

86.4 KB Created: 2021-06-26 00:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd45c447673c9863b9fa04b4cc0b5c4a SHA-1: 43a2646dfaf4530a4dee74cec4741c833c3c5ce0 SHA-256: fc6181731db502d2d0eacbd6c9d9474c23a65088672d7edb46d7abd1a6b36e12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. The primary attack pattern involves luring users to click on these links, which likely leads to phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://orsini-blasioli.it/userfiles/files/60947358013.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/732027b44d08a706b92ea5596886cdb9/xebixugevumupanetefer.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/478fd5aa1e81396614a36d67b8917ee0/susimuse.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608640ad0c927---wenir.pdf
    • https://ph2020.org/FCKeditor/file/61612105979.pdf
    • http://chinahongji.com/d/files/47392715856.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/6fdcc43ebcca976522775d818eed91c4/18131496159.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11bb254fe7---fobefegasediz.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d15b2690e---soxonopudalafodipotogidi.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/94e40f8cce6912712cc5358323b2251b/73099818745.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ffa47e73d9ce3a04c1cd40b2ca1ba140/sakopinadufuvi.pdf
    • http://nktrading.qa/file/files/53072880695.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081352cca57d---govek.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16099d6c83fd16---21295732813.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/34f10f862f6cb26a0175e68a3f4c9224/fakapebazonam.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/6e67c453ee2b8291fff17f29fd3302be/kebumak.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607495b197197---basosasenezu.pdf
    • https://wfca-czech.cz/temp/userfiles/files/mifugajoditebijipib.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed36e12a6---napisojukowesuwosip.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/228427ec303cdb4fff4e5355384a6ef7/sozuposalosufojen.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/zowexenuvezowogukef.pdf
    • http://neodentpetrosino.it/userfiles/files/xadizodimulaba.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ba542714a59---77957573221.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=essential+foods+for+bodybuilding
    • 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_off0000ee3e.bin
e108e942860de7c42bb7ff199b6d60deefb7357333c3b04d91d8b280d2bc213c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 17380 bytes
font_01_sfnt_off00011b66.bin
f73c48b3731ad5dcb123b050b8c54e86c0e46c3e4af73b6d73d66e2848346a4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B66 10868 bytes
font_02_sfnt_off00013471.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13471 16792 bytes