Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7dbb927ab0a0628…

MALICIOUS

PDF

83.1 KB Created: 2021-10-14 06:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2a3de143427e25ed038b60acccad4cfd SHA-1: 9a2fd0597a8d00e976e9db6ad21a624904cfdb7a SHA-256: f7dbb927ab0a062833d29e42d4e55d867810a08169cafe4ed532cde64855ec54
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of link farm heuristics further supports a malicious intent to direct users to potentially harmful content. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615445b471a52---63160663243.pdf In PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16161e5efd952f---96806914024.pdfIn PDF document text
    • http://inercial.es/uploads/files/voziwifexapup.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/c1de83d7a2076e02d9e98de399c53690/puxalemobekeduwemunosim.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/44226284653.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/bemimuxat.pdfIn PDF document text
    • https://taperagi.com/contents/files/bujazonoxawibakegetitul.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/93006435959.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/35e2be8acc59bf77e9cdc550eea71e72/82045729203.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/63681655738.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/22543959425.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/10822811385.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/46816008151.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/muravuduwisera.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/talan.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/12442251222.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/sadojoxoji.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/49775213771.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/wugiwagib.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/xunakurusotu.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/fozofajuvuwibogu.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/1307061746.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/2ea7e85310d56b2e47a95c111d20e28c/97945632233.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20211007045404.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/zuruxixamutenudaxuvu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/7xhmvLXWVJc/uplcv?utm_term=patti+labelle+meatloaf+recipe+bestPDF 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_off0000de94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE94 18744 bytes
SHA-256: a5bb74abccfe49f48a59bd6f066fa490c61bcbd1e65fb164fa00c9b724cd382b
font_01_sfnt_off00010e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12676 10680 bytes
SHA-256: 2c1ed3b727534b8d046669df80d0180ee347328f57132fd8a5e306137b6f3eb1