Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c506f1335d0cd7f…

MALICIOUS

PDF

143.3 KB Created: 2021-06-26 19:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42c21addd11587236852d2591b0914d2 SHA-1: 3770d6f5000f3b9ba3734b547177d2b01bb6bf36 SHA-256: 5c506f1335d0cd7f52aa7cfecc302917b066fdd40da5e889107976782b58c6c0
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://queure.ru/uplcv?utm_term=shore+protection+manual+volume+3
    • http://dade666.com/userfiles/202106file/2021061804504970554.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/a3de4a24271462202efdc9cb0f11c6cd/pufaxaniwurufokimekemevof.pdf
    • https://atlastoursntravels.com/userfiles/file/delepu.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/tn3lrj5vm026sn6qff5ll5ag6k/madasiwanabo.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfce3abcc72---92370275360.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/94aee1e4f1514543d9b40959a0a46610/70466241625.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d839bf5d3---jijuga.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808a3204265---xuludeninijiganosopafevo.pdf
    • http://zjqzzx.com/uploadfile/file/2021061205245873499.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/a6kecng4suqmqdhbcjvmb9dp64/50595949457.pdf
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/57705526916.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094bd06620b9---66133371773.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d59eb9336---90782482337.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1da468bd4---58620353268.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16076cd2f89586---55592581331.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/98d4b4d3b5a00060691ed465e524e8c4/kewubivepifogumeninadiv.pdf
    • http://osoboebludo.com/ckfinder/userfiles/files/56581240609.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c328b0772a---65856935255.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/0gi0lamj7jfoi48b3cbiia12vq/kojodejipekaxe.pdf
    • https://room12shio4.com/contents//files/kibofutidibosugisibe.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d0add922e---46936070000.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ace1a55cd48370d26e92abfa86512063/87915183022.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d1b115a5187e7390bfb52ff92ffb5688/bugukujeveked.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_off0001cec0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEC0 16792 bytes
font_01_sfnt_off0001e6d2.bin
7426a38ad37a51054f8cfd46746b500d310861fd316b9b47b6cd12a46066100c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6D2 18152 bytes
font_02_sfnt_off0002167c.bin
586cddab6a9fc7dafd9c7534345f52e1b76d5ed93341e629864fddbdafa9389f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2167C 10884 bytes

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