Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf8a3ad2ca48500…

MALICIOUS

PDF

78.3 KB Created: 2021-09-04 18:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7459dcd40da8d5a2d229634d52375f6c SHA-1: 998194ca9a874797754aab69e194531fb33ef8e0 SHA-256: 6cf8a3ad2ca485009e9408f0e63358b4d55c7e0788e2630540cc853d2ff13d12
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=object+pronoun+practice+worksheet PDF link annotation
    • http://tvkinter.com/file_media/file_image/file/letetariwuzopobisinite.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7be23ccabf---rizedavaneridarugozuvob.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/86592541701.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfdcde4927---9706033355.pdfIn PDF document text
    • https://xigmatek.com/upload/files/80364423591.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/xogerafaxila.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/11154690113.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/4fm9taqj6t1ekui51ua01ll16f/degurana.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/palufexozeko.pdfIn PDF document text
    • https://tavio.ru/files/file/tapeg.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/fogopukufoji.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/52779273382.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2416efcc0---dawisedowaso.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/36498113649.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b180c870c99---46397635291.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/35127803388.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/44511320894.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/2eefb90bd0ea524a7f2e44d3fe7d0871/rajevavuwefewabene.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/16962308910.pdfIn PDF document text
    • http://mextro.de/upload/files/tamebirubirovoj.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc00ef4157---numefasesawumogutu.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/bgihu1t5ppob9hc5jounttvcke/gebotujazomapox.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/puziruwubomenoxipapizipo.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612a892b2b41e---masurix.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_off0000cad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD0 18100 bytes
SHA-256: dab27cbf350693d295bd4bcd63c7d2f9a515b50eb98f52c79ceb48be938cba33
font_01_sfnt_off0000f9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001120f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120F 10996 bytes
SHA-256: b16f01daec64ffcaba73d5c17c2afaa1e99a725f1c86a311b1913b3f93597fc7

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