Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf206ac0d23443e1…

MALICIOUS

PDF

83.5 KB Created: 2021-06-25 13:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6caed254aa75fbbb9aa061dbafab564 SHA-1: 096ef2bc21ca44d056ba24cc4c1def1a04b7a3c8 SHA-256: bf206ac0d23443e19138f6480cb2d41aff5350ec7500663e042ea5db2147a758
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of these links indicates an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://fitnessklub-impuls.pl/uploads/assets/file/69626385440.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cecef3eb986---giniwitiliwozuginiw.pdf
    • http://billedbutikken.dk/articlefiles/file/2329380437.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16083348dba8cb---roxujavo.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/vozejeneviwome.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/db807073e7c9e01d3768a0eb00ea879a/latenivemi.pdf
    • http://wsystem.sk/userfiles/files/63547167083.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cccd952d94e---godinopu.pdf
    • https://blsautomation.com/ckfinder/userfiles/files/14465282032.pdf
    • https://4appsoftware.it/file/dalutomotezefiduxaxumiz.pdf
    • https://medtek.vn/storage/file/tiririjolu.pdf
    • http://bijverhoeven.nl/uploads/files/77762105179.pdf
    • https://mzlpro.com/web/img/podborky/files/42166278115.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a433224ad1b---logububa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sultan+full+movie+in+tamil+download+hd+720p
    • 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_off0000e2a4.bin
231518be80e0bf365fb29c4ae6c543f19d595afca3b9c33d9297d7a8efd3e60c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A4 17116 bytes
font_01_sfnt_off00010f3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3B 16792 bytes
font_02_sfnt_off00012752.bin
24cbe0a7bf2e70e244fa032637616ee427919e2b868d53150e3ef4d9225d2c15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12752 11112 bytes

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