Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e85b0bb20d91017…

MALICIOUS

PDF

65.8 KB Created: 2021-04-27 19:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89bb2e8063d90acf346a590811db06d0 SHA-1: 8cb7360a58e3d76594db0eb7c04ec4d863c3302c SHA-256: 2e85b0bb20d91017b89857784790519af727833c2edadc5c9d523ba3d7ce214b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/653a4776253b87ce2fbb90939a6d4390/89167452413.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cfca5fb93---19152279818.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071c4685a65c---rebim.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/d8bb5c289048e4a8e1bd953f39ae326d/21993756983.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/b2231a35f6393a30f0472bc79866ce78/47436824128.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/4466bdf77fbdcbef69e2bbd756df8b64/tazem.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/3a585949bfc4844962b2455d4591fb14/bonetazoxirixorogageliveb.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/bcb0e7770b1e6624f0b1d14dded8c626/buxebaruvonelexafive.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160864ca90ff45---xigowomosujaxomafilulexet.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/b5a488d6d8f70abb753a31b3bddb2e27/30534687362.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f3699880---4307592000.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/09688f5af7b8653b118bcc5f510ba5bd/vawuwaroxutajuvidorejube.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/8fe28f6f49affc04c9376f3ae67c9aa3/jadawedofuxakifejuwaxakex.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607714c2230e5---27195087699.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=alphabet+writing+practice+book+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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c805.bin
777f4998fe6d90a061deae1b686df9c70d9f14515056c6bb71cf1f9ef85a0dd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC805 5524 bytes
font_01_sfnt_off0000dad3.bin
82090071114ba7f2fcc86c8079034625617e393dabf88ae12c2fc2ddc4f634fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD3 9308 bytes

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