Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f373ec0de56278…

MALICIOUS

PDF

82.5 KB Created: 2021-06-13 15:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 814c5054744dbcb878cd21f25523c0b2 SHA-1: 2d1080f5cdf2c91fe298165023ed143ba3df8fb8 SHA-256: c6f373ec0de562788c95b4d74cbc95cd1f8fdef123c70510c6106be57270ac91
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=afro+beats+mp3 PDF link annotation
    • http://mhinflatable.com/upload/file/dolives.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/podikamafivusepaxaji.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ggfpgb8ttnnc5egf0o6v15bo0v/nuderawumagivexa.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/sitekamasafu.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/3f81c8b1f4aa4c681e0db873446c894c/56462424898.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/10504157927.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e1a8e22d1---22093064130.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/9d6b2ad522f867d828655d094d72d7ac/68152323538.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a91cf654b5---tejizimom.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d1f7063cd---48387167667.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/14540918139.pdfIn PDF document text
    • http://gyobel.it/public/file/8924398742.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/vigisimax.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/j4lomuqc1r1j33o6a2pb3hh8op/sadogomebolexusakulupul.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6iob4iue10itv8lg8ec6rf3cf6/59837082867.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/438c40b4fb0232315476e4c53f013c99/zirurezezuwevewupideloxef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 5308 bytes
SHA-256: 6a195bffbe08fb9c80ae03fe0a30fb5c733f4f83706b99a0f64ea9db91d7b7b1
font_01_sfnt_off0000fe76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE76 6044 bytes
SHA-256: 29e6ab7bc0f8d70f87bf2b5f1cc99fa8bc81961b68d7bb8d8d490de7d8e98f8f
font_02_sfnt_off00011418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11418 11996 bytes
SHA-256: 4a0666391fd0e185c1f9731c0bc856158acc3921e769551d8f629ac186cca014