Malicious PDF — malware analysis report

Static analysis result for SHA-256 003712873c29ca2b…

MALICIOUS

PDF

90.0 KB Created: 2021-07-02 08:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b60bd6b044b3a1089a5203131008a6a2 SHA-1: dd79cd70a026ec99fad3ef16a007bf9d820e286a SHA-256: 003712873c29ca2b7bc1a624769ceea1e84f04f403c7940a72b2e5f5409c944e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

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 https://archism.ru/uplcv?utm_term=how+to+change+sequence+of+pages+in+pdf PDF link annotation
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/ba0a1cac1f52494c0ae92874cd863fb4/89153168376.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fa4156b7f---57942490289.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/2097014601.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/92458375572.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/mogobemobepet.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3448180d26---tuzuzato.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/d87am2pfga8jtlrg719gmr3q7u/zugusivumaba.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f058127bd---36290605654.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607513f3340c3---gatadutibaleg.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/ce5aaa90e271bf8dd5662ca6c1ed8efe/likixagufeni.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/vivanapo.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/2tu105nlti6576jqhu34klom76/dagukudux.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c8e010b19---87054753981.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e607091a7---37710405842.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/rugapijokalutenusexezi.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f56b29cc8---13190321623.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/xalur.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/6f3edc51d81158ee4b1aee07e3842d38/ganowukavakavugegu.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09687a3fa5---sesawexub.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/6853219320.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/45701995315.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cad9eec4c---lilugu.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d949535030---17615985977.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/zebiropus.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/aohknmgjum01fuqnrmb5vvaa6f/rerixilebinatir.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11378 17432 bytes
SHA-256: b97b2f83b79836e9543c92dcb6e234d80437148f4c1423554eb4ec191885caa7
font_02_sfnt_off0001417d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1417D 11076 bytes
SHA-256: a623a88759074411f681b7d51417102c7376b384f61787c4ace943d36bd56fd0

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