Malicious PDF — malware analysis report

Static analysis result for SHA-256 f431f4e2dc3ed53c…

MALICIOUS

PDF

98.6 KB Created: 2021-06-29 03:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb47c46b48b2b0c2af538ba098456800 SHA-1: ccb33ccb03ad7eb6095167451658bb232dfa7a07 SHA-256: f431f4e2dc3ed53c3b35591cb29da4b75b94b1fa27b01007b7b9d29dcd31d9d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the link farm indicate an attempt to redirect users to malicious content, likely as part of a phishing 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://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d6f0d9026f0a23c57932944f0e17caa6/kiripowofilowolopuw.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b95790fe0c---jidaduxadobaxos.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/df9d311a1e05b657444eeba0171d8e08/suvujomagamofanol.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d688985f85---pejef.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/52320802988.pdf
    • https://majorsagilekvaros.hu/uploads/file/rerikaw.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c2c63faebb286c07ca25cffba7142a9b/82927217384.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070cad46d934---2297546440.pdf
    • https://dakhoathienhoa.net/images/files/38606519829.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/hqlmaljnb5rtds5hkic0l9bhvn/tezunekubetopuna.pdf
    • http://fittbike.hu/files/file/98537079998.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/2933a51e98d14d108f4558f812e81f68/xazemasetejonodob.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab1ed96499---44438818955.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096784a9e1b3---bodatukibewefosig.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afe17a9323e---vufadus.pdf
    • http://iehyun.com/editorupload/file/89117481825.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/095888001af53351e6599cf0090a0b2f/6847397292.pdf
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/ec583b309e9e4b0a9ad62fdc92e8c9e7/61995126683.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077f8943f8a1---riliwowarajuse.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/151aa98792b373041a1310e8eeb0329a/delisa.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086f1d1e7f77---27494944899.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160955dd65d849---87275407166.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/17bc7de742b1fdf81aea4f8f24d406ef/dapujebagugomobezun.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb10d9b248---7267973153.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/74f90ujfu77eu74juvnk3pmuh8/93799569976.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ark+the+island+best+pvp+base+locations
    • 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_off00011bcf.bin
a82338e5dcbaf915f7848556e1f314da981d9334f2962d699455c8b954aea602
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCF 18204 bytes
font_01_sfnt_off00014bc9.bin
2693c0eada34c450c2306ef722ee3dee70a2a88b2fd0475a303e9d9ec154dd48
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC9 10888 bytes
font_02_sfnt_off000164bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x164BD 16792 bytes