Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5fdcb62f729d1d6…

MALICIOUS

PDF

72.3 KB Created: 2021-06-06 19:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2f7fd9f4bd16a8af99f0aa2cedb6224 SHA-1: b4652fa5376dce8354d540b41dcd617d37667b34 SHA-256: a5fdcb62f729d1d672c47fc6439e80b206e366e2b0d4ba13b7eff7c7f37d848a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://medvor.ru/uplcv?utm_term=ejemplo+corto+de+discurso+directo+e+indirecto
    • http://hgbs.de/userfiles/file/97734776978.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609891e4d3326---11505669635.pdf
    • http://ottotech.center/userfiles/file/xivakukepevedesoxow.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/44322406800.pdf
    • http://traiteur-ribot.fr/userfiles/file/14075948428.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6be97512---zuzezusorom.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098484ca41af---50073013082.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d85c30881---33760304610.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/28467486868.pdf
    • https://fajanav.com/aym_image/files/dotomuvaje.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079e1a2c4060---24483768448.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070369bbafec---95651957479.pdf
    • https://implant-drill.com/userfiles/file/74255963800.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608300f0e36e1---97652959681.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000ddc3.bin
92e928b32ea33e50ff0ee20dccdea3d1969e08e41a452a244447db2f479b9586		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC3 5044 bytes
font_01_sfnt_off0000eed7.bin
c678c1c928525bf2d469447dca7c60b7317383b586284530af641a359f810673		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 11504 bytes

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