Malicious PDF — malware analysis report

Static analysis result for SHA-256 e05c95dee1ecca87…

MALICIOUS

PDF

73.0 KB Created: 2021-09-19 19:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc0efe7e5461a5d2bba9d38fbd6b1dc5 SHA-1: 92a4997943c132e9e0c7dbf45c3d98517247aada SHA-256: e05c95dee1ecca876c4a6c32ed628c72463fc02d9cac55cee7593e51003a0234
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to websites that appear to be compromised or hosted on disposable domains. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf32969a6e---xinimovodezukitadela.pdf
    • http://geasit.it/userfiles/files/86241640519.pdf
    • http://vincentianssjp.com/userfiles/file/92899503580.pdf
    • http://datacomsystems.cz/userfiles/file/16995717939.pdf
    • http://goksirkrupskimlyn.pl/img/upload/files/papuveta.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/313d56f7571537bcf447b94aaa819ad1/58859284734.pdf
    • https://darshanam.com/ckfinder/userfiles/files/lafufijivuwuziv.pdf
    • https://bahamianbrewery.com/ckfinder/userfiles/files/tosapokugurew.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/d425de1167d7ee5e6a0002896fd6b141/30163368780.pdf
    • http://lukasikgroup.pl/Image/files/64678259117.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/98a455e87d90683cb26eb7133e42ba32/51264366298.pdf
    • https://barcelonacentromedico.es/files/galeria/files/50975341737.pdf
    • http://poney-club-romilly-aigre28.fr/userfiles/file/lokivesilag.pdf
    • http://test-immo.com/file/90276103850.pdf
    • http://mediedil.eu/userfiles/files/fugonawubofunadaj.pdf
    • http://cassotech.nl/site/data/ws/files/95563815460.pdf
    • http://daisytalavera.com/userfiles/files/2335463418.pdf
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/95119444699.pdf
    • https://unifor975.ca/userfiles/file/rewupogepo.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161474221dd38e---dusodonolazix.pdf
    • http://autosoftware.company/autoresponders_images/files/sekudidaxevebofowinigok.pdf
    • http://studioriboldi.eu/userfiles/files/92575278708.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=online+random+video+calling+sites
    • 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_off0000bc83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC83 16792 bytes
font_01_sfnt_off0000d49a.bin
0adb5dd6d8f81ddc50c286b0c715538a359ecc22dfe52ab427ac469cb5393e5f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD49A 10804 bytes
font_02_sfnt_off0000ed4e.bin
5a6ebfe9d3e88010b8f5370f7254806b7248cbd7dc08be6f7a2d9e901a0c6c9c
pdf-font-stream PDF embedded font (sfnt) at offset 0xED4E 16084 bytes