Malicious PDF — malware analysis report

Static analysis result for SHA-256 8154453edb069233…

MALICIOUS

PDF

116.2 KB Created: 2021-07-16 21:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88b9594731a484ea2148a51d66a8c1dd SHA-1: cd39d570075a6b09121058c5c4fe633d8ba1a996 SHA-256: 8154453edb06923331c4d7d260563ae300ca2b8173a1b00977b5fcca01c1e679
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 it functions as a link farm to distribute malicious content. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. The presence of external URIs and link farms suggests an attempt to lure users to malicious destinations, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1b5bbbc31632c0833312303b01fdb6a9/kuxakogezofifetiliveto.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dcb538a71---bezirizezusebemujix.pdf
    • https://aedwea.com/upload/foto/roponegosuwavafa.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/e1b9925d66ba0c4f3b17fff279d79d2f/36547814533.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084223177da6---19783728653.pdf
    • http://mintaialuminum.com/d/files/savisexabebuloduguw.pdf
    • http://halaljones.com/uploads/files/fijasorigav.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/pejusasavedolofezodefofub.pdf
    • http://ricarda-allegra.de/userfiles/file/mepawolijepimarezuju.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076f13985ae0---78041201140.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/75ee5eded672798ffea919ec4f7286fd/88392081263.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/06186faee3f000cd4da20b056916eca5/17304490983.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/0fd6a586cc7abdd8673d7ba1485ee071/xuvaf.pdf
    • http://hzdsbg.com/uploadfile/1626098513.pdf
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/numomet.pdf
    • http://koreanhotpot.com/uploads/files/rapupirufuvefozuxo.pdf
    • http://frangarcia.eu/upload/file/foxokolo.pdf
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/jevunefaza.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/3c1fc078a18e9c6aa727644388b92bbd/ripelozimoxuwokuvud.pdf
    • http://playeasypiano.com/resources/fck_images/kimejisowawaxebux.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/vql4smm2igcbultkolhb4cqmk4/pufiwopilimeragub.pdf
    • http://maduraigarlandshop.com/userfiles/file/46534724804.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9dde4383e---86214590589.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/88bba16566a4768842e081bd42d625da/42938515151.pdf
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/3978880711.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/ef20db77e932802d1ac4add37631bd28/jobigiwekevup.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=victorian+learners+permit
    • 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_off0001652d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1652D 16792 bytes
font_01_sfnt_off00017d44.bin
02ad7cda878b48768dd00e72571424afff34cec8a4bece9d7a59f3bf7c31d71b
pdf-font-stream PDF embedded font (sfnt) at offset 0x17D44 10504 bytes
font_02_sfnt_off00019528.bin
f1fed084f0824f34131b8bc54e2f4aaa14c386f34a8ce8b55eef8476322b7306
pdf-font-stream PDF embedded font (sfnt) at offset 0x19528 17536 bytes