Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b068c39f79712e…

MALICIOUS

PDF

94.4 KB Created: 2021-06-08 16:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b70cdefb6dc32b29b68aaba28f8c36f0 SHA-1: b8194cbab249de74360af4f5bce1e4775848941d SHA-256: a6b068c39f79712e7929a64e799dae8de2ffa25ca5bd62e0c58854dcaf7815ae
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs points towards a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL analysis suggest an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://wastran.ru/uplcv?utm_term=calorimetry+pogil+key
    • http://biosite.ru/images/news/file/31202448651.pdf
    • https://cplastik.cz/data/cms/file/pinuwusoma.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/346b8c0aeb11fe1c947958a74e3dcb7d/23609508403.pdf
    • http://anhbanglaw.com/userfiles/file/51117602785.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0u5jtj4mf4rga70sav0ahls42/jugoxaketivodi.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d06956354---69226342608.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090221849a9c---69829191684.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092e52ab6c59---48812109818.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a31f7fb6d0cc1ffe4b366fcd81ca8645/9659988884.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094668750e3e---52236479567.pdf
    • http://okulsanmalatya.com/imgup/file/wolapomo.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba690492937---mugemoduxotebevosugip.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b771c08cdb---jisuropevaluvidinorezek.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4e6d64ba3---wanokufi.pdf
    • https://luyenthitoeic.info/userfiles/file/vulorol.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b86bc0924b9---sipawiwejurelarowovisu.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092e9468a790---1149623592.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://scripts.sil.org/OFL
    • 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_off000124a3.bin
1d645eaf2cb258e2c898d06a9540950a226812ceaf3e97a0a7715f028382fb05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124A3 5032 bytes
font_01_sfnt_off000135ba.bin
312fc0f62767955e008c33e66b5c14791f325a06fb43c84e72698bdc3d631b51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135BA 11260 bytes
font_02_sfnt_off00015c2c.bin
a1bdc24ec6dc0332449754d26803ee00bb6717469f64a18f47c680e22104396b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C2C 16080 bytes

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