Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4f9cdcb7adfcea…

MALICIOUS

PDF

91.1 KB Created: 2021-07-05 06:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de7628bba53820e5ee087a3cd52d0ae8 SHA-1: fd8c9d5bb5c53d700b6e2bd46aef2a69b6d233a5 SHA-256: ce4f9cdcb7adfceaaaa0ad1f82c439a34f499499ee681800a8d372676203d717
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=sing+a+song+please
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa66656a7---84397305643.pdf
    • http://brukbet.com/user_images/file/xuvupopali.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ff7399b09---malegofemuguw.pdf
    • http://actybrain-consult.com/Upload/files/nugafujuzeditamewujube.pdf
    • http://app8itebarandgrill.com/admin/images/file/4076911408.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d89cec77b---xejibepojiju.pdf
    • http://anhbanglaw.com/userfiles/file/3078631737.pdf
    • http://emurus.jp/userfiles/file/zibozikovidaw.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d5d4f0503---54708582156.pdf
    • http://nordicaluminium.ru/userfiles/file/69937800030.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/6f83c333753cfab0c6fd79eaf4493491/49664862003.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d77b86c65d---dekinutewixidomolufiwuz.pdf
    • http://sterkrade.net/ckfinder/userfiles/files/nisenaven.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/qi292l62e8b4h6p3pf3v4snnu3/64489326708.pdf
    • https://bbgpiti.com/userfiles/files/dudavetuxivowenetakaripun.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160784a3a484bc---jebasatijuwozemutirezofax.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160afb5ef55e93---36351560509.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-5-15/20210515033749293019.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974f1fdda03---jagenofig.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/b2e55d8dc94e0ffcc31ede7656226a5c/xeguzebug.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9a07e3d28---fobigenanepusaze.pdf
    • https://condominiovillage.com/userfiles/file/baragamiwumijarubeno.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607af4b7b63b5---linuwofimutezivake.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c055e7b438---29635918569.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9794ac3b6f---44974885190.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3c1.bin
9542ea17bbb99e70015609775a2e08372d92203f5490e38e46c473da1bbddcf2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C1 22688 bytes
font_01_sfnt_off000103ba.bin
da6f83fd12d59a8d952e8bcac142c1e14ae30129e32d3d9b505cb55c792e6a01
pdf-font-stream PDF embedded font (sfnt) at offset 0x103BA 10304 bytes
font_02_sfnt_off00011b00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B00 16792 bytes
font_03_sfnt_off00013312.bin
1f5a478c519854cfb4fe39f5c27efbe9f3e44ef9edb75278fe0bdaf87e5b82fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x13312 16292 bytes