Malicious PDF — malware analysis report

Static analysis result for SHA-256 09537d7c90af2c2f…

MALICIOUS

PDF

79.7 KB Created: 2021-07-15 10:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92ce32570a2225a8a84f7d4485b6cc46 SHA-1: 4f7dadc876b551f0ae327ad753ea2adbffc5b158 SHA-256: 09537d7c90af2c2f59e2178a6c4ba13169235ea8fbcb236af106db7399f5f519
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/f65edf6741fb6ca7645fc0c4bc4dff39/76003164158.pdf
    • https://peilimineko.com/userfiles/file/36126774951.pdf
    • http://pumarecovery.com/userfiles/files/gagezibifukexenafedogix.pdf
    • http://strategie-online.net/catalogue_dynamique/file/folezigo.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/1a0c188ea66d29285d6c8a8306b4f929/kisexuwijas.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1ceaf305---wepeziziwifolunose.pdf
    • http://cherryontop.pl/upload/fotki/file/56052894281.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4c1b15142---vijowitijotimelufetosi.pdf
    • https://agatanorek.com/files/file/49792400774.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/457a331a4417486f8e113c43ed833387/29079674644.pdf
    • https://ludifrance.fr/userfiles/file/40826442213.pdf
    • http://ilovegabal.net/fckeditor/_upload/file/69243726743.pdf
    • https://kasihpaham.com/contents//files/favosasutavimiroxuka.pdf
    • http://al-farh-iq.com/upload/userfiles/file/fokosiridu.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/f2b49b9cece2405837879582943a1ea3/68902407894.pdf
    • http://minutemen-jrotc.com/clients/84940/File/74730634380.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/055df1bb915f2804cd82233c439b3b21/monulokowebigu.pdf
    • https://ktmcollege.org/public_html/userfiles/file/pifejevawidus.pdf
    • http://ciaooo.ru/uploades/userfiles/file/35747599624.pdf
    • http://stardentalcare.org/userfiles/file/ruwinasedeligemijemuwiza.pdf
    • https://tradingphrases.net/userfiles/files/nukuwexonapelawomo.pdf
    • https://ottenburger.com/userfiles/file/javemigiferajilisebejonu.pdf
    • https://soechi.net/userfiles/file/95318051167.pdf
    • http://aimic.com/userfiles/file/51814066709.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=4+types+of+air+masses
    • 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_off0000d5ba.bin
66292a5b44069b256d79f37ff3cad97a9e2f57a8807955708de1b407728812cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BA 16932 bytes
font_01_sfnt_off00010206.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10206 16792 bytes
font_02_sfnt_off00011a1d.bin
f95e4b1fe953ae8b068da646be4bf3b2e60daa189ce140e4f9f26263bdda1c0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1D 10464 bytes