Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4d8e03697ed6e5…

MALICIOUS

PDF

89.1 KB Created: 2021-09-02 03:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79d844f9f08b3ac342dbcb751c6ccad4 SHA-1: df6c05efb5708a6eb49704d8f6930db87261c435 SHA-256: 4b4d8e03697ed6e51cb5526e05a420f84f144306062928292f8d6962d0a08b16
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to external sites, likely for phishing or malware delivery. No scripts were extracted, but the heuristic firings and URL analysis point to a malicious document designed for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3bd9cf76a---puropabiwigabewosigu.pdf
    • http://flgr.ru/files/files/bexiburajavopu.pdf
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/tidolofobivinibaxakudovop.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df9d54f024---jebarosazonomomifipo.pdf
    • http://zensushidanapoint.com/uploads/files/talitukafug.pdf
    • http://hattingtoemrerogsnedker.dk/userfiles/file/jisozajokawomed.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb0e63d3e6---ziwamizewijopikaka.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b3b9cbd98---82341067027.pdf
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/leruxitokubevufufamu.pdf
    • https://pointswestliving.com/ckfinder/userfiles/files/56316160127.pdf
    • http://bouwbedrijfbouwheer.nl/userfiles/file/fanalabobenuk.pdf
    • https://wietsevoermans.nl/ckfinder/userfiles/files/78207695022.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a72bd4e4b---10649877904.pdf
    • https://harkakotony.hu/UserFiles/file/34909373797.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffb8ac6538---viseb.pdf
    • http://stalmont.eu/userfiles/file/63864538648.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c98b95093---tebaxiwizakeza.pdf
    • http://chithanhplastics.com/uploads/userfiles/file/86286234998.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=nf+the+search+zip
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f93f.bin
4bc36fd5b12cdebcee4d3c228d7acebe59d339d83ec192de4b403670f68f5515		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 17856 bytes
font_01_sfnt_off00012732.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12732 16792 bytes
font_02_sfnt_off00013f49.bin
7cefefb63d158d4d11ec2ad1738b0db1fb272e0e8417459454f5042e77612443		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F49 10344 bytes

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