Malicious PDF — malware analysis report

Static analysis result for SHA-256 5572c59446735c03…

MALICIOUS

PDF

76.2 KB Created: 2021-07-04 17:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90717aca36de12ed808b6294adcc0715 SHA-1: 3ea9b9291b5bfc33bd10c46f7740173580b4bc71 SHA-256: 5572c59446735c03b71a6fc1e5e0859a8143467f8f19a01d957078f0653b79f0
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware delivery vehicle. It contains numerous links pointing to compromised WordPress sites and other potentially malicious domains. The PDF structure and embedded links suggest an attempt to redirect the user to external, untrusted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://cructi.ru/uplcv?utm_term=mud+on+your+face+you+big+disgrace
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ec46824ad---87978940845.pdf
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/4747053404.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160804bd91116b---34283106742.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609403e1c9a65---xugivixugeforute.pdf
    • http://exosportsante.fr/ckfinder/userfiles/files/58187598236.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b8d1af63d40a040233ee149cb3910cc8/9591061445.pdf
    • http://vetcarefoundation.org/userfiles/file/nazemaja.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608289ffa5da5---62462032812.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/h2bhsfkfdfuqjtrrbm0pn5g6ko/44379598570.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072078ea8804---22610498739.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/6281bda0b02221f06be3648ec059507f/mejewutubogunologij.pdf
    • http://reikihaus.com/clients/75291/File/faverowof.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6d697e9c1d2c83f01e0175c0d6b4b446/8188351614.pdf
    • http://ei-windykacja.pl/upload/file/levojo.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/8d1fd5406181039016c47b8776a7f02f/57677351838.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a05145e5443---jogelixakafuniwumerom.pdf
    • http://classicalgardenornaments.com/uplds/file/19407881895.pdf
    • http://geoodwierty.pl/files/file/guvaderesesezufipib.pdf
    • https://lacecinella.com/writable/public/userfiles/file/putetizoxuwe.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c27a2c498---58740595670.pdf
    • https://capitalsyndic.com/userfiles/file/fekikajanevobidobu.pdf
    • http://dienlanhlongan.com/upload/files/kalupalozamowutesuru.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/2vqeh7rvtjom0bbll26bf8v2ti/dofosizolusiwifulupuf.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ab87822e007---11118078819.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_off0000c4d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D8 16792 bytes
font_01_sfnt_off0000dcef.bin
fb1738946483718c3bbd4c99af5e03c280d0eaf962c840daff28a4acaacccef5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 10852 bytes
font_02_sfnt_off0000f5ed.bin
b108f0e7ced3e5215b2c62795f41e2d56235b81f2a887a96ef7443e9f954b46a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 17316 bytes