Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44aec869a482672…

MALICIOUS

PDF

75.5 KB Created: 2021-06-30 07:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f298c71d0387e4ae4d7139e2317b4794 SHA-1: cd6595c2891e804a293d565a1427c14608c479c0 SHA-256: d44aec869a48267269c702842f82669d5223f50e461985994f7edfa3d698694c
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to websites hosted on compromised WordPress installations, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, and the document body was unreadable, but the presence of multiple malicious URLs is sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f2ff72d55fa59bb9741db20e3eeb6406/67539984709.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609878cc96912---60076417617.pdf
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/gumilulumivusetimak.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160984ad9a91f3---xuleruwafewale.pdf
    • https://faprosid.com/file/77094757134.pdf
    • http://a1-automotivegroup.com/upload/files/29854157186.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3e46a5ece---suraso.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/62epmj9pqo7nd59c6ultq2i941/bajubilaju.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c92f4e43f3---sapujanativ.pdf
    • http://www.knickmeier.net/images/pageimg/file/fomizogelifewojifevovojer.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160802f44b8255---14386938607.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff06f132e0---34165304790.pdf
    • http://cmcthailand.com/ckfinder/userfiles/files/sixoxiwadutuseruvem.pdf
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/raruxokefoganofewupu.pdf
    • http://thermogroup.ru/uploads/files/80486059808.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/h522c095gqa4bot165lii1muv5/71889627022.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c874811b9f4---budobibosidimize.pdf
    • http://malifer.hu/upload/file/47883989479.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/k3572mqpdqqbn2sgu0jlne6u6h/jofewesakovenizematowufoz.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbed2fc6484---67306507985.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a50480003e---megizuru.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d67a8c8d68---56682230095.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b608d235bcc---59041165613.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/7953f5a1466a863d53d7c952ebecf9cd/89533760774.pdf
    • http://freeski.hu/freeski/file/sufojovubugorudi.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac622998279.pdf
    • http://archinfo.ru/uploads/file/zubinog.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=oh+the+wondrous+cross
    • 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_off0000c81a.bin
43eb9a567e64d6148359f0028b6c3e850cd02d66c2bb8d45f4dee21d4682b10b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC81A 16160 bytes
font_01_sfnt_off0000f1d0.bin
e4c0b1e1c029bd110312feeae03b2426992c14ddae28cd8a44f3b95f95b262cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 10380 bytes
font_02_sfnt_off00010956.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10956 16792 bytes

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