Malicious PDF — malware analysis report

Static analysis result for SHA-256 6021b3bf20c28df9…

MALICIOUS

PDF

77.6 KB Created: 2021-09-19 07:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4459811892e5df65a94a9a7f1c5bb71e SHA-1: cdcf70f6e5df26715cd8950dcd77553797f5ed66 SHA-256: 6021b3bf20c28df96c0d3191309ad0567a46eb194ec88516a87f53fa5ff17ad0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs and the nature of the heuristics point towards a phishing attack pattern, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://orcasproje.com/userfiles/file/13622290476.pdf In PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/1463835157.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/mizubeduxijojadiwatowev.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/pugoninoduguziwive.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/gexubudawisuxug.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/33242770741.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/50093695774.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/fezunan.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/058e0c2ca3b018186c1426f35ea5bc9c/befuvek.pdfIn PDF document text
    • http://honda-vo.com/upload/file/17487366878.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/sedamuvajidunar.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/xuwotojijogodumuxafi.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/12940838662.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ff0d9343a---fojugerivapedotajuxew.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/87447495259.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/sigesadenowa.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed691eb4d8---bawolepuxeku.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/rulaketosewaw.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/wekemodelalunisejuvilus.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/mawulufib.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/26645967572.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/kipeg.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d061cb0d04fdb714d5aae749f947a857/wevobune.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210908_054636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ocarina+of+time+rom+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_off0000cdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD1 16628 bytes
SHA-256: 164c9721d9c9d488e431c6e7431b11277a5e9ee6a9a4e4e9cdaf55d7e019efec
font_01_sfnt_off0000f885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF885 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001109c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109C 10580 bytes
SHA-256: f4166ba932dab1607711ba4a8a758395f8d1a3040d02590645ef3eb061cba318