Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6e7500f6d5d506…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 09:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c42d0c45dce74b5616560e9507e80756 SHA-1: f40f0aa277d146d7668fda4695ad57a0a5008813 SHA-256: 7c6e7500f6d5d5062c18d4fc715a41a2d8879398397480368a4f5ae701edfe99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm, potentially distributing malware. The PDF contains numerous external URIs, many pointing to compromised WordPress sites, suggesting an attempt to obscure the true malicious destination or leverage SEO for distribution. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160859013a82b9---20465809130.pdf In PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/wanotireziwobirezevu.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/0f62da9cfef4e14fe450e60605018887/53610382281.pdfIn PDF document text
    • https://peterdegendt.be/file/436202071.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/99304494942.pdfIn PDF document text
    • http://goldmustang.com/files/files/giwizotunixeniv.pdfIn PDF document text
    • http://jaht.com/userfiles/file/19326348427.pdfIn PDF document text
    • http://simonide.org/userfiles/file/muridatajozave.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/49709781568.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/ripovepu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bbd7d6d2b---52898131078.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/t05uscbduvng2ui6mqeeqdc8p1/57652694098.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/dejudorefalap.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/gisoz.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/9bcc18ff17c4d421eaf42a5e34046e48/99578246424.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/91915829897.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/16sq3a1j2c9iv1psu4un32jp9m/durapotixa.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd62d1cd23---29847499528.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/19111133258.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/91a78b936dc37363bf9beaa5f80d7f42/44392207891.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/ferog.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/56ee1d3935b43bd25d00128f2975a533/17952287578.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/56935363322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=acoustics+of+a+building+pdfPDF 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_off0000d6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 17684 bytes
SHA-256: 643e05ad4c1cb9521ae41f984ce16b11291b414e9d47ca6acc8b4cd123f66b02
font_02_sfnt_off00011ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE6 10784 bytes
SHA-256: f1af2c70142a64787cea5ed38a9cc5f540d1e9f310cd93545464ae7837a5ebae

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