Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b92581bf6f2859a…

MALICIOUS

PDF

68.0 KB Created: 2021-05-12 12:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f32c0aff722adec17dee4d95687d1be SHA-1: 50cdd4b6c569812d5f4cd1a1c2efae7aa8a182f3 SHA-256: 8b92581bf6f2859a484436101aceba8b4914d32aadef89866452eb804b434ed2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm that points to multiple URLs hosted on compromised WordPress sites and disposable domains, likely intended to lure users into clicking through to malicious content. The document body is heavily obfuscated and appears to be junk data, suggesting the primary malicious function is within the embedded links.

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 http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5d481845---paguxoguvejozugega.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/nimelerinivavafuga.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/52rcqsj8fltifd0p8vud77omrl/32748007971.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073249615f3d---47399927229.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/a87785c90731c727b3d4d5d4c33bb29e/55346796677.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160861c4ba7883---lijepukadekadi.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/1be4d19a1ca5745a1ecc18b45ef892fa/diwegetunakawomodizamudu.pdf
    • http://aucoindeshalles.fr/menu/file/45358369926.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608026a4cf2bd---99101536.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/18449a3c8c8fe44d6a8fb7fb6d424b89/bobekomowagolumexato.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/f4a33114e27329da4cb51f972841d6b4/xizunonalekot.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f714b1f06---89369068582.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745959a8f38---litode.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609846361238e---taseporedojovexiwagegan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=bayliner+175+swim+platform+for+sale
    • 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_off0000c994.bin
983a4349749df1a9411e05e62d5df3871cb5b0c3f3126e482c2a8ae6f687b0e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC994 5548 bytes
font_01_sfnt_off0000dc87.bin
c7f093b4ac2017eab973913ecf10face9a72bc221daee252b488bd62231eadba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC87 10892 bytes

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