Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ffd89cca24a9fd2…

MALICIOUS

PDF

87.1 KB Created: 2021-07-05 02:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c34014ded00e8ba59a5c38f0ab49dc2 SHA-1: f6b2895243ee17264a655421b02a990f95b5d8d9 SHA-256: 0ffd89cca24a9fd23b49d202a7e1055160ea04b42b8c31327204b8f1080e2a74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URLs are indicative of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://coretry.ru/uplcv?utm_term=flower+color+combinations+animal+crossing
    • http://1-cx.com/ckfinder/userfiles/files/12966157569.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e27e27dfac---46796753341.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075dcaac20bf---82241331894.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/54429815036.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/i6f973i5pbcuas1og2rffr1tn7/mipibogolurule.pdf
    • http://skupka54.ru/upload/m/84019956045.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988ff676110---83329799842.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/9ea431bd35d4f7764e7cdb1dbd2abd63/33512280937.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160810fa631f75---musedamiketekaj.pdf
    • https://protradingindia.net/userfiles/file/37838490053.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/c0i44plvhlb5kccpqeie5h6j9u/fusepabumererelizeke.pdf
    • http://nena-artspace.com/ckfinder/userfiles/files/badilibuzujipunivawoxinu.pdf
    • http://watthaistuttgart.de/userfiles/file/wijolanugapas.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/4b8cba6c45cfb688594ed1a6b3dd4d66/64922406678.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/3d1434f093219a9e10d35c02a4eb5438/nodamadobuxajuxe.pdf
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xutos.pdf
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/wenibaxomareresiru.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/o86f8rq7s2ht8evirk3ouvo1i7/pejewobenojumurariloli.pdf
    • http://yonseri.org/userfiles/files/libirema.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf7aecc1f2---bejebope.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961a20d91b0---nagovu.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/i0hmgtc1eed1om3tj822jjaav0/97309688517.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_off0000f0c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C3 16792 bytes
font_01_sfnt_off000108d5.bin
2695af947412022d9e83f1926de8835ef84308c2468aa82c53c48e9a64d07d54
pdf-font-stream PDF embedded font (sfnt) at offset 0x108D5 17172 bytes
font_02_sfnt_off00013601.bin
e9307d9bc0db4b730720f2eafc4f5d2507b2ac11a9e051600bf03b9a29cabd96
pdf-font-stream PDF embedded font (sfnt) at offset 0x13601 10776 bytes