Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a6d7ee2d3669abf…

MALICIOUS

PDF

76.4 KB Created: 2021-06-09 03:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03592773ab6b9edf03b3f4dffc85ac2c SHA-1: 8d46eaa41b49a9a0ad5b6848fcc470ed2b159d09 SHA-256: 2a6d7ee2d3669abf718b59a4ce924cfa08600a119e4fded18430e491f1165b91
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs further supports a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious campaign.

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 https://inwebjor.ru/uplcv?utm_term=band+9+writing+task+1+academic+samples
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a06317ceef1---xonuvuzo.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5c6cb76c8---82407266666.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/609a15bdf10e50105ce3e6254997e8cd/46101632299.pdf
    • http://highendschmiede.de/highendfiles/file/56481511161.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/u8j3jbuar2ka3mm1rlgb36kdl1/91570914621.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/6f866c354526ef88230336611609711a/busikugalu.pdf
    • https://raptiherbal.com/ckfinder/userfiles/files/kijomubupaja.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/ce25dd9b29cbe7594bd9af5b43396998/juvibixaretizexezavejevat.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/eb40946178bdeb322f1a9cf3956aab02/27088659222.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070be1f9876a---topev.pdf
    • https://motelandratecuci.ro/userfiles/file/87848521566.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088baed1fb23---46989927132.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62e9e52714---xaregarilejoz.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/tjahq7s36l8ku7ssj156d132rf/96317196519.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df5e.bin
cf995b45fdd46a2f35d52a185bd6550e1d264163147afe70ad26b2cbb6b9bbac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5E 5484 bytes
font_01_sfnt_off0000f206.bin
0deff007b1f0719203d98d2aa5b3c3e6f693a6629174312442dfdcba0099f5f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 10680 bytes
font_02_sfnt_off00011693.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11693 4324 bytes

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