Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e07a6a54d97f6a…

MALICIOUS

PDF

81.2 KB Created: 2021-08-19 06:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16be86f9d9b0b076500a4d390da2edcc SHA-1: 1305a69718e4205f46da3ad5be521a8ce187d894 SHA-256: 93e07a6a54d97f6ae3176b4f88dc5ea02e9207320878156ddb55d4dd7834043d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed for SEO poisoning or to lure users to malicious content. The embedded JavaScript likely facilitates the redirection or download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=fnaf+4+halloween+edition+apk+android
    • http://fittbikese.hu/files/file/xunutikojavugejal.pdf
    • http://bright-mineral.com/uploadfile/file/2021052505265966.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/jg6d8i5vuhhoi7br2j5dshjer0/25306417250.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609af37ef19ba---63420976499.pdf
    • http://swaminarayangm.org/userfiles/file/51751486852.pdf
    • http://bestbuyfromindia.com/userfiles/file/73314599322.pdf
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/puwigonubaw.pdf
    • https://toocapen.com/files/43784651919.pdf
    • http://fxmeat.com/upload/file/29fb1256a3f54dee7040e90ac5df2070.pdf
    • http://promocode.lu/userfiles/files/29686447190.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/t7thfjpe16ee2je3l10l51m5q2/mopatavebi.pdf
    • http://creative-format.com/upload/editor/files/33356827601.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca379f2934---wikepukiwegagob.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/nus0rfmco6aolvk9m3m7pbr870/1977947055.pdf
    • http://leadingedgecorporate.com/user_images/file/rapepetexiroxugira.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe776c7ba1---14125769906.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/13878741392.pdf
    • http://slanfusa.org/clients/47225/File/palamenukopavapopezunelup.pdf
    • https://aodaixuan.vn/app/webroot/upload/image/files/50143671306.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b446b3e9139---sapejesojup.pdf
    • http://euroteam.vn/ckfinder/userfiles//files/18173795789.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_off0000d73b.bin
0cf5ec74d87ca251721ca4d331273965247bc7554fdc1e1f9fb6c12a052d09a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD73B 10660 bytes
font_01_sfnt_off0000ef97.bin
b2f192beb0d54a7c3e01efc1a46e439a35adef65802a9789fdd18a967e1efc7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 17488 bytes
font_02_sfnt_off00011d84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D84 16792 bytes