Malicious PDF — malware analysis report

Static analysis result for SHA-256 994c5ec125daf72b…

MALICIOUS

PDF

72.0 KB Created: 2021-07-24 02:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7bcf5337304d855871ef243d776988eb SHA-1: 9eab5b14b13495ab11b42f9f1d3f4a15a9e5e9f2 SHA-256: 994c5ec125daf72b4eba251576610415477290e9f18677cc86a5c4c1fd48fdde
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest it's designed to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9027

Heuristics 5

  • 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
  • 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://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a2b9c2541---87920748380.pdf In PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/01e17ns3fk48g6d6fsl81buq50/fozatulobulaz.pdfIn PDF document text
    • http://ktcz.eu/files/files/56798290009.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a01d0c229e---27909112899.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/namofuwivuje.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/290a3c3433d968fe2a99b47663b5697e/poxakuvivuriti.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/75176535579.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b52e2578ef---54644282490.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/71134168077.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/kutupozurixuludemepoxi.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/ad839f3e57ad0c001e67cfefeb75463d/vikopuz.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/46966072653.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/42a46667aa8e8de680d1819006994b3c/ragelitamenepusakivejowa.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/labaniwukokibefi.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/8db9c26dae76be8923c0de46452e6ae9/guxowizexenidubirezune.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d4875b4074e32e8f0a5ec1001cc4428b/wegewegikikoruzex.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/minozemezamafo.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/bikovokeropomufobeleduras.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8jdrtfqtns4ap8nqqcnadumrb0/71383376517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=sundari+kannal+oru+sethi+cover+song+free+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD476 19056 bytes
SHA-256: 9b8e216e6a7b9ac19e22c83d0667e863b25b35245e160b753ec1970a1f751c54
font_01_sfnt_off000105f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.