Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4dee627e8f58fe…

MALICIOUS

PDF

96.3 KB Created: 2021-09-05 01:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ccc3bf721c6fd506eb723c91e486b50d SHA-1: 5b3b6c50f6af50e623ff0aaa6ee3aae8f360149a SHA-256: af4dee627e8f58fe5355e102588b955257c74413710cfa7b8d22c4da879bed3b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised CMS upload directories or disposable hosting. Heuristics indicate this is a link farm designed to distribute further malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://tovicetour.com/FileData/ckfinder/files/20210626_EFCABFF187455539.pdf In PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/60785030807.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/suvidekotosi.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/96578491132.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869976b5d89---rozuvivodudukijaponi.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210830_201208.pdfIn PDF document text
    • https://technische-dokumentation-hoffmann.com/upload/files/dulegutevawek.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/mikncocn6orudevmvjp7ljjvt7/nuvag.pdfIn PDF document text
    • https://avvocatoboretti.com/file/bunozude.pdfIn PDF document text
    • http://infunplastic.com/d/files/pegemanakak.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/7ijkmkea4p7rjh2tc1mg6n0re1/pedikilapabal.pdfIn PDF document text
    • https://andhimazhai.com/images/files/ziwez.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/goruz.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/6074913881.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/55201955512.pdfIn PDF document text
    • http://abwessex.com/uploads/files/nodefanibo.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9cc21e19d4e09d6feda6a9be0f81fd6d/67167558268.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/wifulokogilusebabasaped.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0abbf9f246---pirokilosivuxufubijilolol.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160715ac22f7b6---50059302717.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/46spmqtp3n69v0nvlq3ei0tbc2/jojasukibatusigisejovogep.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/90736666730.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/95338982621.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210816080619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=la+dictadura+de+franco+javier+tusell+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_off00010cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEE 10864 bytes
SHA-256: fb954c50ff7a6296a38f38a5c4b3b509411e0b53ff04534d0ae61016bedf3402
font_01_sfnt_off0001261b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261B 20336 bytes
SHA-256: e5ad603f29fca851b04b7417588d90ffca86fc54e1a3c8eae856472fb90f95ec
font_02_sfnt_off0001596c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1596C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1