Malicious PDF — malware analysis report

Static analysis result for SHA-256 5304765376072e27…

MALICIOUS

PDF

90.8 KB Created: 2021-06-26 04:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 890b102f157b5f32883ad3e6fa3e6b2e SHA-1: 34ccde9ebd755fc3d2d2d684967fd69c4ddda221 SHA-256: 5304765376072e27b0002bc853cdcc9f5459af09fd0401d32fc70a99f507affb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/pj8tb4mt0bhnafm33ckvuabi92/ligevexusojidoxuveg.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16097b7602ddf7---tadomoporaroluwaz.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b811c099e8---vilatekexagorudesoden.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/bfc69ae0aca302cd027b11aca836f6cd/33077802811.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c57fd7d91---55134714616.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087dd85ac810---fusajuxagupo.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/8nd3ha9tj78mqsaf70drl0fcl7/jugixixonis.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/2d3cfe5836d330e80bc0fc48f6b5a558/zumogidepigukeluvaxop.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094cca242d1e---tokusulubomazexonijox.pdf
    • https://ryokanclub.com/FileData/ckfinder/files/20210618_07A367AA474C6F5B.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826a3da423b---bowejijow.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b40aefec746---vasadoreparatawev.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2651d85905---sipegabafikelizozezize.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d44c23e93cf---59532552959.pdf
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/93356772498.pdf
    • http://rubivina.com/Images_upload/files/39143470673.pdf
    • http://nakatka.com/files/file/44851537732.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735124527dc---tejefij.pdf
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/3226677490.pdf
    • http://zonwering-belgie.com/ckfinder/userfiles/files/tawuzajok.pdf
    • https://cr2tek.com/userfiles/Proj_Name//files/barinuzovobidelofasidubog.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7q5695u16u2fnf22gg3ksnfmo7/49845078752.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c93c1f85265---33283339618.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/1703427ce0e452a7afe45a1564e3102e/20011176763.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/857c57fa44275386873d54167c35f123/ronofol.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+a+sheriff%27s+sale+of+real+estate
    • 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_off00010304.bin
687ca4b99d5754a9e8baf901ff6bb873f59944ae33511aae932063f3621417fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10304 10236 bytes
font_01_sfnt_off00011a32.bin
78edbb95c7c535ce2b7d65fc5f32f0f55b41f68c044716d67c128e59f221262c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A32 16768 bytes
font_02_sfnt_off000145c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x145C7 16792 bytes