Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c933c929325c95…

MALICIOUS

PDF

88.3 KB Created: 2021-06-26 06:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f12cdeb36979d9e0f6c86393919d0e76 SHA-1: c04f41c3691da4d7ea11eab83f44aa819f8055ba SHA-256: d4c933c929325c957c07296e55191ea77d31527a1f027474ef987b98b8e29edc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it's designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, likely serving as a lure to encourage clicks on the embedded malicious URLs.

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 https://crewmak.ru/uplcv?utm_term=rule+of+thirds+composition
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83b03704af---40050133055.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086e2e425635---toromefegeled.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c727156f1ff---9137563704.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160951dca8642e---mizisajisexatapuro.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/u2292dn4g00tntduq4mhbqf11m/27226196278.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797ddc23c6f---64230179805.pdf
    • https://skyzoan.com/cake/beta/userfiles/file/47792169809.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2e1c05a198ab137e223b20fbb7ce9455/tumivuvutozuzos.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/944e60bf1205450c1de703e87e0be65a/pejizoseku.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607583c9b0c45---fajawafavoranoxez.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c487de98f2---82346066226.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/xovem.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb4a10b7cd---1691679112.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/d8408624438e2578abf91dce61434868/kipadizoxokobigavokoxozog.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/b30cnpse3uu1qf73u5mr027gg7/93243083363.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/e61tirr5si263m9ksggi53cstu/mizut.pdf
    • http://tokyoto.pl/UserFiles/file/degudulabakanowalis.pdf
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe9f1901e3---91794483625.pdf
    • https://guijek.com/userfiles/file/vemafiwanuxipafog.pdf
    • http://moreit.ch/productinfo/file/99685068260.pdf
    • http://szentimresiklos.hu/upload/file/kotifumexapufuxekirero.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/idoksgcbjupmol74ojsdjsts91/kefulekalajox.pdf
    • http://pierrevillers.fr/mairie_files/file/zibewurexusirovod.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_off0000f570.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 16792 bytes
font_01_sfnt_off00010d82.bin
32f98d7f8c877660219bbf28cc9c5956c2ac9b0e04c7b25b2e14b39556ae3258		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D82 17476 bytes
font_02_sfnt_off00013b56.bin
e6699d3e8c347e17ed1d7f7c26433280b9c5a0ff1b861b9296345a96a7432d1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B56 10868 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.