Malicious PDF — malware analysis report

Static analysis result for SHA-256 b562a03208b42cdb…

MALICIOUS

PDF

79.0 KB Created: 2021-08-07 09:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6819fbb633d65c08e6293ec9631166fa SHA-1: af959f074d420f04e5484e27006628b9adb83609 SHA-256: b562a03208b42cdb60c4d779c07a32d6ba92f3ae96743c2080a07e2209f142b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of compromised CMS upload links further indicates a pattern of hosting malicious content on seemingly legitimate but compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pixomot.ru/uplcv?utm_term=download+dragon+ball+z+tenkaichi+3+wii PDF link annotation
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160700ce5f122c---95794748245.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/c6kfjessoahs8lkrbuc3kdeg4n/putupit.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/65335013275.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/9dcecfdc40fcd269c1ac00a4b6b612d4/sosafaxuje.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/2cb7a104ebad2c7c8f05f9d9dc0de5e4/91752547822.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/t31v44688452t7ioskbkjliho0/jugod.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/bc2d897b5c709ae6ad782351c6500131/jugovojowapaxofogaxilux.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/16275730916674cef251d56544a3cf.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/jetulixivenasij.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41c228e610---sidarilipipog.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/17574161438.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c07f46f2af0---33150322627.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962c3e2bdc7---pixefebafoxemadejerifopu.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929ae3d60b4---felitafux.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081c1b7d7cbc---fowexokasakuwoj.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/ac2f39e7370f7b8e2b30aea175b9456b/levebafixikuzupekotuvenix.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/cd4b5194b19578eaf23b03b6b6aa0802/zurozapokowe.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/jajodipeduxoba.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/voxinuramifeleb.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/49366883379.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096de213d927---11338569241.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://classicalgardenstatues.com/uplds/file/xonetupevez.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/zomitugeperebadurotoxumu.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160b712c549120---33114016196.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/zofimu.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_off0000cf79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF79 11032 bytes
SHA-256: 6e947b605d2e47d3a563a1050d6b6f4b6d39e0e964fd59cc86f6c8cdc01d48c8
font_01_sfnt_off0000e8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FB 17352 bytes
SHA-256: b2838bcf8d7c902d9ece9f841fa37950256a290de2994d387c92d134939b3985
font_02_sfnt_off00011580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1