Malicious PDF — malware analysis report

Static analysis result for SHA-256 b873f780c7a8c168…

MALICIOUS

PDF

88.0 KB Created: 2021-06-30 05:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46a5e402f20e7f18c1ce4384dbde390d SHA-1: a75765338b5d293de7713c230ba6fb74f46f6075 SHA-256: b873f780c7a8c168cb2c60b05476ff2c7d8dd687cd01470d36705e9ed9200264
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and link farm heuristics, indicating an attempt to direct users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://inwebjor.ru/uplcv?utm_term=how+to+make+a+daylight+sensor+work+in+minecraft
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d28364e56a9---12459679710.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa0c17de56---zivedajoxevapubilik.pdf
    • https://carrieres-pierre.com/userfiles/file/36666763356.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d9b71ab14---xonag.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0f386fea8---tezasejimodip.pdf
    • https://smartcirclegroup.com/userfiles/file/71139347305.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/4b346e30b7080a5f7b0acb5b759ce6ce/68249773391.pdf
    • http://herningbadintra.dk/app/webroot/upload/files/fanuzimubeniniw.pdf
    • https://melz-feu.ru/upload/99330610192.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/12ee727c64adc0094dc3941c86581b40/xijagokifagejumojaruk.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4582b1758---84959963255.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160753ffd6fede---77436490469.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc994377df---65471517141.pdf
    • http://feach.ie/images/uploads/file/vexevi.pdf
    • https://burgaseguros.com/userfiles/file/48512912111.pdf
    • http://carszana.com/image/upload/File/63976732333.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16074991422bd7---sageniti.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072f94d8e9a6---16193088601.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f8d640b1b04a34aa42433b48f52955f6/bimagigixasarelepivinuz.pdf
    • http://ecole.ru/text/images/file/zigotawaputilozerurur.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608312db97df2---puvurizolebemajuzari.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71a32ac37b---majesesimewarel.pdf
    • http://chineseclothingonline.net/File/molinagubutakedaderipazi.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/k7tulfuukvjq4oh39s1b3gqn3e/76873656621.pdf
    • http://apartmaji-zunicmile.com/uporabnik/file/6185391519.pdf
    • http://blesk-stroy.ru/userfiles/files/41868097940.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a5f65ca35---favogorogekawalunifizud.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_off0000f57e.bin
f8a640bb863c5b063473280ec99ab088a553a4a02df6e6bab1901942b3f482e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF57E 16540 bytes
font_01_sfnt_off0001207d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1207D 16792 bytes
font_02_sfnt_off00013894.bin
879bb5902bb7f0b4e50cc3cb22ff9cff19cc493961b9c57e151dc66938eec0c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13894 11204 bytes

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