Malicious PDF — malware analysis report

Static analysis result for SHA-256 26777906ab6a3a6b…

MALICIOUS

PDF

72.7 KB Created: 2021-09-08 04:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ee6ea3e500079854c234185d4b909c6 SHA-1: 0f31215d6d8d8d61ef777d9b1830a14689dbdbad SHA-256: 26777906ab6a3a6b94dd1f4b874c28b310a57696ce83ff62180c49f99034f4da
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The heuristics indicate it functions as a link farm, likely to manipulate search engine results or redirect users to malicious content. The embedded JavaScript is a common method for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=jsc+scholarship+result+2017+dhaka+board+pdf+download
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a214ff2da3---79969390820.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/uo5q2m2guqmsc97ae6c7nuroh7/xupekefekaw.pdf
    • http://ahcxdq.com/uploads/file/031511231256.pdf
    • http://accessiblevehicleservices.com/userfiles/file/zizimoxurebe.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/11719545a2868dd9a38d746a9aebc6cc/lizuzabiwem.pdf
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/a2b342260a6f08d920cd308cf1b08136/valegupujilugive.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/85be0ed898876e863c6aa13c41d3e961/34896208055.pdf
    • http://evpltravel.com/xv_image/file/nupakamikidubemer.pdf
    • https://kimcert.org/E/file/lilus.pdf
    • http://rund.cz/UserFiles/File/nikalofepugesakasesuguxeg.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/paranezed.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbabd737279---33488198346.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/99hctgck2iqm3s6jm4ap24b97r/57396036851.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a55e3dbedf5---82754870733.pdf
    • https://cafesca.mx/ckfinder/userfiles/files/ximamufezanose.pdf
    • https://auditorescr.com/ckfinder/userfiles/files/62307855063.pdf
    • https://proxus.nl/file/bodakesasugamuba.pdf
    • https://altonika.pro/files/fck/file/turelufedopezibubalu.pdf
    • http://chapelguild.com/images/usr/gubewolulebuweked.pdf
    • http://musclecar-taps.com/js/upload/files/15667047697.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ichtmb3cf6kdils4d3ki3lgtdh/jexigizapif.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072e867b42a2---kegawudux.pdf
    • http://onmamtour.com/FileData/ckfinder/files/20210806_8E9B3762EEF9D9A2.pdf
    • http://salkim.com/userfiles/file/xupadopazelorazoka.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b940.bin
24464a60e3119ff77fb818c2775dded8ebd070528a4c6f22694d020f2e0cd0b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB940 11468 bytes
font_01_sfnt_off0000d450.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD450 16792 bytes
font_02_sfnt_off0000ec62.bin
5ecd990af6f9c143401149819c2ad9cc85596573f0796b199d429080d7756591
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC62 15688 bytes