Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fab59ee05106f8b…

MALICIOUS

PDF

186.5 KB Created: 2021-07-30 23:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c18701b7a6bf43956c146e021ddf9dde SHA-1: b34d0d9aec56047f3b3f2548c814dc956585a577 SHA-256: 3fab59ee05106f8be6b813174b669056df8291c3bc4b5bc62d78a9e216ad6e1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content or engage in SEO poisoning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nexusmediation.nl/files/91103478544.pdf In PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609becc0b9a7d---domoliwimazifipu.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/69f9238d4385651cf5891d5d96986923/pavibapaloka.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d34863a0933---83218746431.pdfIn PDF document text
    • https://tjpapigroup3.com/contents//files/62549398610.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/4f877b08790e846e39435e261197c65c/7383579843.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/95803470085.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/dotufupa.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/81977807331.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/cb8dc8e5ac22ee0a0916bd518e584ddc/raxukotosesedunekum.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/xokusegenukusa.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/843271595.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/dosuluxejosodiziripaz.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086a2187a0f8---7505379387.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/57703260592.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/42119049632.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/35241673271.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608572a949c36---82730452970.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/zepipolijevefozuluwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+are+the+gnostic+gospels+wikipediaPDF 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_off00026b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26B72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00028384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28384 26404 bytes
SHA-256: 12825b68c3fa694f9fc8c3a91b6fbbb5ffd339ef0e0ee296dd4101eaf8e653e1
font_02_sfnt_off0002c275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C275 10964 bytes
SHA-256: 3dea6b4a029e169fbffab84d5c4c21feeb95342f13fd77003496f4fe44b83fd7