Malicious PDF — malware analysis report

Static analysis result for SHA-256 f406f89d0b5de306…

MALICIOUS

PDF

79.9 KB Created: 2021-06-26 22:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58091074b020a117607643e24bd781bf SHA-1: ba633c2f8259311688163ea157b2e971ce3114f9 SHA-256: f406f89d0b5de306708459ac78411154cac45bcd5d910367ef3e9c3aeac5158b
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites, likely to host or redirect to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/83c614c843bf7dd6f8eb01269eecc2ca/dejisedakazabobibadolipo.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4u88ukbdi78de8vcpce2ama21i/kepepatabanijabanitemural.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/ab5ee02a8585e187e85849e8d25944a2/58812361709.pdf
    • http://ersatzmonitor.de/userfiles/file/wazodekasukisi.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/15ae33061f09850944dfe393e938bd89/96848959954.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/43130a1bdec5b647813fb09308a0c8a5/41133530613.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8ba90ddd2---kopoladubizonaxo.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/dn14b7l3v0ogcmobb1t8hdgu71/94163570946.pdf
    • http://shinies.ru/img/lib/file/88737513371.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d27a5fe016d---wafifo.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608223ae2131b---xibenaxinebofolixo.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f68493f785---48119644868.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b23319f57---68229550650.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721dbd0d6ce---64415531501.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/65f988229b82b6f6855aaf6aabfe342a/17589943106.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab57531b54b---gavirizesaximax.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a66d2901---73098987310.pdf
    • http://gtshotel.it/images/file/fufupaleluki.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c131fdba233---83851117257.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b2092c290---gukob.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16086106117f19---wezazimizotunikupogokebal.pdf
    • https://lawina-radom.pl/files/file/vogezejaratumaxonezatizas.pdf
    • https://gomaihoa.net/upload/files/mudumiwegisaxukesusakon.pdf
    • http://tutek.eu/userfiles/file/mazawejizeterejenuki.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=verb+to+be+interrogative
    • 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_off0000d262.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD262 16792 bytes
font_01_sfnt_off0000ea74.bin
5f62048857b7f88153715c24e9e8deb8fc5837fe2666e3e6a8d50b8cb66aa89b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA74 19304 bytes
font_02_sfnt_off00011bf0.bin
8980a176568672e6b6a36215cbeeff319595eb7b548b4b9ae4a951deed47a4d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF0 10244 bytes

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