Malicious PDF — malware analysis report

Static analysis result for SHA-256 42523c2e1c3d2fd4…

MALICIOUS

PDF

87.5 KB Created: 2021-06-28 05:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f3bf56cfe70197a992cdfd2fb33ff09c SHA-1: d7e952503841a4bb338f8a866657804536cc2e9b SHA-256: 42523c2e1c3d2fd438d353859909cd376044ed2041a5bbfca629cb9d0d2d274e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, many of which are hosted on disposable domains or use 'utm_term' parameters suggestive of phishing lures. ClamAV detection and ML classification strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of multiple links to potentially compromised CMS upload directories further supports the phishing and potential malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=30+second+timer+powerpoint PDF link annotation
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/buf543tcqu45hkcndi70cmqdh2/12968650834.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8699d87faf4085adfe3c7e111eea14f0/samadojijugorib.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/lisev.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d925094a0---98641080187.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/mcapko269s4g5tkp6qksfr23r3/puxumop.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/jm37vtmv59o4b2cp5klavh85me/67340274306.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/2f2d15b4b5bcf966c9697ed47b7bc099/latijozofuxezusozolalo.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c70c9ccca---nogepazorivev.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732794b8b14---tifolesesegu.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ace8f380c2c---98810959009.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/ccc65698df48688c750dbda5eca8baa0/motatemupi.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/morafofogugajibevatiwu.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d49b0db17777f992428ed97e65f68912/27787640250.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16222449726557.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08c6b271ec---10310747897.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/d8b73f3ec19a03cc84f1fca9cbfbd282/kejepomufazimi.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d70fda2cbe---16318102878.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a281e9c6b9---veboxixuje.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1cdb204a3---66476912235.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/9d71b4453f261e8e7a969eceb3b8415d/68241101855.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/eea820bfa6a043bbb49bc885364a1ffc/67093442321.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/muvukefikutimo.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/1ulc4i6q17v2h3d1eauid609tn/tidisexitosamemajegi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/11efe82297e57ea292651a405082f498/xupikivikudetalusakupib.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b802060b39f---pexerotukijufemofudef.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_off0000f3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F4 10752 bytes
SHA-256: 4649ff4c256bc0e7a10096091a9cca866576a190fcedc7312b168a1317a5d83a
font_01_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 16932 bytes
SHA-256: 80a50261c6fc4be7848c9d06989c7cbc6c162f08913dda48a11d84541abea1e2
font_02_sfnt_off000138ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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