Malicious PDF — malware analysis report

Static analysis result for SHA-256 36699b270ae8901d…

MALICIOUS

PDF

99.9 KB Created: 2021-07-03 08:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6198a3e9759efc54d43d3edd02f8a735 SHA-1: 4c055eb4bf7db125b318ed1aab11c47300894b98 SHA-256: 36699b270ae8901d945491ccd4ad1189a675fda496b24fdf810c0dff67c17fb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious SEO or redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/rb83067rtf3jlu1r4gbdj6tici/90359241400.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/3501f43cf5da1f9bbc26cce004d404f7/67301978981.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/dabda9424febf5ab0c09e941a50e7ed6/tawegemofoxalojujuvuwufag.pdf
    • https://cam-ceeds.org/ckfinder/userfiles/files/moximalidotikuvimusovewa.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607591f703167---22084801255.pdf
    • http://a-kamen.com/userfiles/file/76789768957.pdf
    • https://koreayokogawa.com/ckfinder/userfiles/files/zujagevaxewisi.pdf
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/2ccc2dff8d661245a49b4d64ca3ee063/mewinadukijagezajupewisor.pdf
    • https://monyetjoget.com/contents//files/24780957285.pdf
    • http://georgekoldun.com/var/upload/file/61437051024.pdf
    • http://www.aadhar-interior.com/userfiles/file/lewavel.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1683a600c---54248548172.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/258375727f239a6b8c1da04959eee644/86568281589.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe32e2aef8---87253985158.pdf
    • http://cokhihoangvinh.com/uploads/userfiles/file/6947610567.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160740fee1a0e7---17382633530.pdf
    • http://rehahomecare.com/upload/editor/files/lajanidiwaxomomuw.pdf
    • http://pobierzplik.pl/uploads/files/dumamap.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607366042332b---vigatoxiligasasezos.pdf
    • https://educhina.mn/editor/files/dipaneti.pdf
    • https://thegioidongphuc.net/ckfinder/userfiles/files/magexasew.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608276651a47d---78382832090.pdf
    • http://thienlongadv.com/upload/files/93636376491.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=hair+cutting+style+image+man+indian
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20921c2b2c---90405351469.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118d5.bin
0afd1ad046527db0fc1f23f15e6e967d3cc4c099a9f803f4499fc4bfead47487
pdf-font-stream PDF embedded font (sfnt) at offset 0x118D5 10796 bytes
font_01_sfnt_off00013178.bin
efb96dda600ea6642aca8838f1237736c283d99933e4fad9f8d47c13f9d8ae4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13178 16564 bytes
font_02_sfnt_off00015c5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C5F 16792 bytes
font_03_sfnt_off0001746c.bin
9e2b1fd039d9ae845c95126b1c8d32b43abc82e410fc0bc106a06cf0f6338915
pdf-font-stream PDF embedded font (sfnt) at offset 0x1746C 3336 bytes