Malicious PDF — malware analysis report

Static analysis result for SHA-256 493c9a08b4b4a9bf…

MALICIOUS

PDF

84.7 KB Created: 2021-08-15 13:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7e877cefaccd9b37eac28ca2b9ff9e8c SHA-1: d626fb4488b92f3aa557d7f547653b26e9ae1be6 SHA-256: 493c9a08b4b4a9bfc1c1b8ecd973cab80de2484dc9df036312e0be2cf0c61ed0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links indicate an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://studio45.live/wp-content/plugins/super-forms/uploads/php/files/53mdlle3h52feapoohi2usp4v5/29839594390.pdf In PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a858b49627---38108160549.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce0c456b4c---31228784983.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/kikuxexesakilegenofizu.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/73584731549.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/52a7e14b117a4ede887ac4595cebaa1d/81642562501.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/357841aba96dd85b008464ab60cbdb2f/zebudufubefibufokete.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61296725cd---598758852.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/06e0f5a1e16267e4a74a93c2a8face8a/55991352834.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609064e3e0425---damazez.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9d4c1adbc---jadososejanelowusubuguxiw.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/81697272804.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/48157420818.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/tadefobuw.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6bd3e71cd5d0bfec13779eb64fdd03be/79906993880.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/16725979231.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/4134878845.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/79162349791.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/53773396654.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/3b5cea7538fb15e1990fa8f9c1165d77/66809545824.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/baxisevaribu.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/fenorupigulesezufo.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/19242375089.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb68d4a83e6---duwajusejuxulivorabuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=reading+comprehension+exercises+upper+intermediate+level+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 11380 bytes
SHA-256: 6c08df15b53666eb621d10b7327cf9671e77898294d9bbe41841720c68124ea4
font_02_sfnt_off000115bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BF 17676 bytes
SHA-256: 22437426389110205dbb7b44f4e7d3c9c921ea29530ecfa68056495f2a3bda62