Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a44a2d0f1f326b6…

MALICIOUS

PDF

72.1 KB Created: 2021-09-12 06:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de00317fec820084381f893c0532d924 SHA-1: 8ea1179807882650641880ba1f96232bb4d989bc SHA-256: 4a44a2d0f1f326b6c750562f5e090d19d007b029ea97fc03a3a46075d678ece0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this, indicating the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://comlark.ru/userfiles/files/mikegisatuzilukajozer.pdf In PDF document text
    • https://psfund.org/public/uploads/files/cms_files/75327947490.pdfIn PDF document text
    • http://kodemari.info/data/files/gumikupasubemapik.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2192c16af---80261778319.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/5829710977.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca70b0ccc0---81679680559.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/76032980526.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/44106016070.pdfIn PDF document text
    • https://5udua.com/contents/files/55346435306.pdfIn PDF document text
    • http://sissonne.hu/editor_up/dajat.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/73120807138.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b0dfd4e43---gedufitasisax.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/44463688183.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/56402506728.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/keguratew.pdfIn PDF document text
    • http://entrackintl.com/uploads/89917090511.pdfIn PDF document text
    • http://cartopack.be/Images/file/49714779153.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/kolukisixu.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/26767929187.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/vawejetabukolug.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/77661072809.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/patepejupewoz.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/xawix.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae51f24fa9---16758977359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=wuthering+heights+by+emily+bronte+pdf+downloadPDF 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_off0000b5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C5 16804 bytes
SHA-256: 55a8d486af146dc953c9d5099a9da4f0a4fa0db055564e1e37c6506962f00bb7
font_01_sfnt_off0000e02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02D 11380 bytes
SHA-256: 6fa745dd70ebe241fc0beea963953333c48d5bbd6ca26086438c64ffbf685e86
font_02_sfnt_off0000fa76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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