Malicious PDF — malware analysis report

Static analysis result for SHA-256 64aae4a3ebf6e388…

MALICIOUS

PDF

123.2 KB Created: 2021-07-04 07:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f2fcd81a9b55afe3eb34d33ad9d9665 SHA-1: 44b8034fc6f132a3934c2ca4353a14a15940a041 SHA-256: 64aae4a3ebf6e388a3552b8c4a63de94f6942a909b86308aaaabdd5870a20639
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms hosted on potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings confirm the nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9758

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 http://akinmedical.com/uploads/file/nebefuladijuzedado.pdf
    • http://videofilm-tv.ru/content/File/wagugunudeligi.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607816acbefd8---rimebomozowu.pdf
    • http://tragiaocolamsapa.com/userfiles/image/file/fujese.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/95d19a607437219f0644c56174bd446b/bisumanuzepede.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/52693970692.pdf
    • http://www.bash.cl/media/file/tiguzo.pdf
    • http://scpt.it/userfiles/files/sewubolidaxuwur.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/kiwenovumurukipife.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4db2a2258---2677150614.pdf
    • http://sooclose.eu/upload/File/tobujiboliwujizivimo.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5275b7489d---77154202317.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/p8leo7iv6h3fklni1lknhhadaf/85058045441.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fdc747f84---gifaz.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c089e829616---dexizibu.pdf
    • http://www.cbs-emballages.com/upload/file/wated.pdf
    • https://ssmavidiyar.com/public/content-images/files/dedemebekovabedo.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3678a9cb0---90186750989.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1e1b55cdb---60026852720.pdf
    • https://pottoka.info/files/galeria/files/99694580658.pdf
    • http://dominoliberec.eu/images/file/files/29798014156.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/973c3u8k9l5geufqkntfjofrfp/waxiderofumagibovasiki.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/b4e9f6ca427608e568392025ab8818dd/97424424302.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986a38b02e2---notoxovukutonut.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4b230f20b---mikimitifapiridumuwez.pdf
    • http://vantaibactrungnam.vn/upload/files/pibagiw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=flutter+meaning+in+malayalam
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016629.bin
f271cfd1fd610220a0ca2e848e61e7fbaf8a05c85e0df2300cc1470195369735		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16629 10356 bytes
font_01_sfnt_off00017d79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17D79 16792 bytes
font_02_sfnt_off0001958b.bin
a2bfbfcb64eff6ffccde0f2cfde050b4f472ca171282ea614685f213ef838bb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1958B 19696 bytes
font_03_sfnt_off0001c980.bin
8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C980 16060 bytes

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