Malicious PDF — malware analysis report

Static analysis result for SHA-256 413a6770d6b24a93…

MALICIOUS

PDF

73.5 KB Created: 2021-06-14 08:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b1ecb0eab6ccbd4f6c1a8a39e027f1e SHA-1: d043a71f45769327c1f3296230ffea3e76ba2386 SHA-256: 413a6770d6b24a93f86c139bf450ca873f0d85a7f9662f3371bef0be2c711971
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting domains, likely for phishing or malware distribution. The embedded URLs, such as 'https://smidgel.ru/uplcv?utm_term=quiet+place+monster', are central to this attack pattern.

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://smidgel.ru/uplcv?utm_term=quiet+place+monster
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83ac6a28be---segijumagukus.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/276f4b76ff223aab4fc9742b17c05946/94485592463.pdf
    • https://mamap.in/ci/userfiles/files/89571411351.pdf
    • http://iphysiology.ru/upload/samusolu.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160963b3bc317d---55249440004.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/sg1db2cr30lrbaugkgl3p7fon6/rapofiseriwudij.pdf
    • http://aeronautike.com/userfiles/file/23535815996.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/809bbe857aec3eccf4658d70ea10c5b2/80657897192.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/03ec01a45904204800247859e0a660a0/76517554659.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86fc36768a---roxefili.pdf
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/57876491324.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080eea4703c2---78200567558.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebb2c7a98d---xuxexa.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160906156d2695---meriwifojo.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_off0000e2ec.bin
2b0e0627f05d158bf4bf84946a3773df3547c09fdcae852db46ae6f427041335		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 5140 bytes
font_01_sfnt_off0000f44e.bin
c302e5f4720f7dc65d9d4f709aec1221a83c37a4ae0c5cb9fe4b34b338a41a8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 10884 bytes

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