Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc6a569046c38a6…

MALICIOUS

PDF

86.2 KB Created: 2021-07-08 11:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f7ccc36ed0c710e526f78657af8011a5 SHA-1: b889afa9fe8928a51aa2f2dffe255d26ec3ded86 SHA-256: acc6a569046c38a6e8018f029de8e3b092088baf63a7d04453597712a8f1e4d8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/6b9e015c22539ac28b078c438a0bdc8e/wexetepikuxobaraso.pdf In PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/bazux.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/u5d49l6335pefccatq0hil4be5/51571263936.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/dad3b523a128c3cd5d55ea333b923a47/kasofubisasisimerav.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/wajojatagoxifiwozujo.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/88b34ee22bc34ace0d952c9a9f3baa1c/23086754077.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094a4c96a250---ruruzisos.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/21839094655.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/h28g831tonvtnjfn9okqc351d6/58753214456.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/5fbd39d734cd83fe3f745a60dd7bb33f/99491344945.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/dv9b37hlvjcf2togghnk6n1ksf/lazovusefi.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf90194b4d4---59155315434.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/rapivavuredis.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba64c763622---81881206611.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f87704ddd---39049242508.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/diguzekitotemiraxozur.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/7faf139103806ddbf5fe562f1aec5ba0/wibuxikolax.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/52776989472.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac066f1600---44985399060.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/3fde1aeeab069c241ff430de7169a5d3/wojojawoxadujosiboxinogo.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/lorubajut.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd20a90350---23530295706.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/50894791039.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/caf36444fff741c0526e27a1d5f71519/tazirirereg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+does+atherosclerosis+affect+blood+flowPDF link annotation
    • 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_off0000ee64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE64 17184 bytes
SHA-256: 94904fe5846c732e0e2e5ff51a619d8a436c7a14413c051950a76e6180a2f49f
font_01_sfnt_off00011adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADF 10684 bytes
SHA-256: 2c1b382eb358a7b30e85b55035a2eb76a0528ebed431e5c94b3598c65e507fe2
font_02_sfnt_off00013381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1