Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6640603686530e6…

MALICIOUS

PDF

83.8 KB Created: 2021-06-29 05:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19ef8e16dcc4ce1ce33553282052c997 SHA-1: b4713199396ccd96f732bf39b2d6c7b4e2d50b98 SHA-256: c6640603686530e663065d370f0517e1ad14a533c68e402f58906f806af14177
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous external URIs pointing to websites hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crewmak.ru/uplcv?utm_term=largest+island+country+in+the+world
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f9fcefe90b223be71a9974f58ea4a507/bovodokotiweku.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/6e2680236708b7fafad1fd9b9b9fd054/duwubib.pdf
    • http://degrossier.nl/uploads/file/29505399706.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a37b52bbb6b93ed53a0b90c93f4b7bf1/laripegoderarad.pdf
    • http://robalton.es/Albums/images/file///dufamomavegenepodo.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ffc37f4d1f31e1b370f3d1b23522298b/86340688444.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9b44695fd---tolojabepefimolegofen.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6a10e7e80---duwiwogawivunewofonomi.pdf
    • http://franzoesischebulldoggen.eu/userfiles/file/28770181661.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607376e7a4ca3---49600553083.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/45b0f46e3f39348f77e9527c75337991/19587879422.pdf
    • http://www.radiooro.com.mx/media/images/uploads/files/wokumakotivisewujosaba.pdf
    • https://polnische-zaune.de/userfiles/file/3337602283.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c107c33137a---domulisek.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1d6782594---80863276304.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160747f8502378---49800432578.pdf
    • http://remobudostol.pl/pliki/91441055554.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://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_off0000e3b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 16792 bytes
font_01_sfnt_off0000fbc9.bin
33412fe10d279eea387a3cde36d4394b8f177119835f730f4924de724813cac1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC9 10904 bytes
font_02_sfnt_off000114cc.bin
af99789a8608572820e9e250187c044015fc1f51bf281030cdf85f6d73ee93c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114CC 17496 bytes

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