Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13b6de1f9f4e599…

MALICIOUS

PDF

92.3 KB Created: 2021-07-02 10:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0230d79d049306972c0940952d483dbf SHA-1: 40c1b62a9eb017e3d058a5ece8f17ef7a75d6af7 SHA-256: b13b6de1f9f4e599ced981a7e36c1f6ca1cc471e722bce87bddeedf9ecaa02ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content. The presence of embedded URLs and the nature of the heuristics suggest this PDF is intended to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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
  • 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://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607086221b877---pugitakarik.pdf In PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/55793866219.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/9e5e1a244474cd2c93b2fcfd3856c451/bivozepafovawulajo.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed04f7c64b---fezebelaxuwimu.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/66506692658.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/31024597601.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/65482591107.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/073q6qeoij8qnl734rtbue9l10/60283263210.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16072172543472---89660849935.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/aebbea64ffb79ed92219774603b5d904/wifaratonusu.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609747c4563eb---62254901661.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/34533655748.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/63273051838.pdfIn PDF document text
    • http://954move.com/clients/4890/File/53582530275.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/73630475110.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e71273050e168a01b27c52e1917b8f56/nuwufupenok.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c165625dc13---riniwewokitap.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/rutonuwenireloxekevad.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd9b90b1b3---bizivirofavawe.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160aa17a615d22---depejaxixu.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/8233a9aacbbf1c35816a5c6d2a0791ec/79243102678.pdfIn PDF document text
    • http://sns.hu/_user/file/loxakarigotusadufawumu.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/msei088n8qn3pf689po5g2kd29/70725452242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=gratitude+is+an+attitude+meaningPDF 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_off00010910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12127 10564 bytes
SHA-256: 5afd1b9e4c122df802280313e2ed6ed7cafa45b323f4838eb4b26a321017fb9c
font_02_sfnt_off00013906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13906 16628 bytes
SHA-256: 427a8391a748acc6a07ad48a57617b63c62ae37e0653e61c91b82617c5782eed