Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6721280c6b0028f…

MALICIOUS

PDF

103.1 KB Created: 2021-06-26 12:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7682b72c85f8d03ae7506943a8e8b8eb SHA-1: 66e4400fc3564cf0add8f68abea2f09b7cfd9507 SHA-256: b6721280c6b0028fb4e2fd1d3350bbf15a262f3025f0381ace8f3a534b9e5e4b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support a campaign aimed at user deception.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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=sql+collation+types
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a32cdad6f7b---bitodafagibavizotox.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/2f415a4dddf3c04778001eb5913d066b/nimisowepi.pdf
    • http://red-persimmons.com/upfiles/editor/files/29050393574.pdf
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/d4a5f14de6feb629fdcd0ea0c82da38c/91106541951.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7a0d385d60f37daf271584605e534f52/48205447371.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987c5371e60---96385153828.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/23e71fa8ab6d297f9f374a6037ecc915/repopisepa.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609e525d5dd4c---56376545098.pdf
    • http://sutphinsgermanshepherds.com/clients/21958/File/pitizu.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdb6931d6f---43185915231.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3065d4525---24600125318.pdf
    • http://bjbtrh.com/files/pic/file/35259891699.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cc5eb1f7f---22447409463.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/fd99lbnl0pcfbbg91uuovbl7kc/90897333936.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/45668575745.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9a10e1a1b---99239984417.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/fe824a9a2fa316c98b587e51dd792ec7/tidepejiseni.pdf
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/tipapeperuxaxorolu.pdf
    • http://evohome.pl/userfiles/file/15629551582.pdf
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/h19ndq5t70qh9g2quv60onv5hb/fopubebigajusenudidudaxek.pdf
    • http://magicdiscoradio.hu/userfiles/file/mevebugabow.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61fdaa364e---wikimag.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3bo4c7unndggnpekv34b3fjqk0/43328803051.pdf
    • http://curry-box-deluxe.de/userfiles/file/kexusemewubujeronisad.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b3ogo3qqneahg1oiuut3f3iib7/19857063686.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160886b00457a4---nabivoratena.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/d79c6711f581194741c83d30440922d1/nopuvimosol.pdf
    • https://atl-50.com/files/file/nojupolutasozamexudilufim.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_off00012e09.bin
b422badaa94fcbfeea72a172826ccc967241b751506ee8ca247bfbba92220d46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E09 10600 bytes
font_01_sfnt_off00014664.bin
3bd6d09bf442c1c9d88c01297568c685ddae2e72f558ebfc0313a49749719dc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14664 18700 bytes
font_02_sfnt_off000176ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x176EA 16792 bytes

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