Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd59108f4a120ebf…

MALICIOUS

PDF

99.5 KB Created: 2021-06-27 11:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a4ad64b72f21c0af3cf659641f1401f SHA-1: 198c3367bb94d8e5575ffa1efb26385b7835836a SHA-256: dd59108f4a120ebf66e15b63dcb8f004c72bd2ca7738d24de53f834391316bf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

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://garglob.ru/uplcv?utm_term=how+to+become+a+mermaid+in+5+seconds
    • http://andlupa.com/userfiles/file/22060300251.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/6s2t9rmsdaiart8ani45q826b7/23074183069.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a14380829fe---japavuwebifedugafirir.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/026d7bbc52eca14db0dc862f6a60da0e/bipuzurobavez.pdf
    • http://lysfyyy.com/upload/files/mowarusopuxojinikakal.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b81bc54c2---nejetenedifuvijewuxivofap.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/kpf0nadur3fb1t81pgqsoftiu9/78001845487.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608137afdbd26---vuwulesefut.pdf
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/25715876151.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160855b055ae4b---89676781668.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fd929f4a5---73497437416.pdf
    • http://www.nomorcantikjoss.com/file/patipuxifatut.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/98c2dc202d831771fda433b20e5f1caf/nenuzebebu.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/v7034jdc36ngtaoj87q1th9hf3/4941993036.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/d2c8c8eb2311d67360333d0f98e1495a/bozonegazawabedonisirok.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/loweraruluwigolitadiwe.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090c72057260---muvamowaboxew.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/s76su5rafe04g5pb5fv7v55iu5/fegowugosug.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ada65b1a8---43698796005.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/fdcab832a5f363163fd1311e4032d6b8/kuxaxidud.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/07b031d4ca30f4d0e87f2c28da1e6728/namafawapun.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcf218183f---ziwev.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e30e6bed95---5601389091.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa87f15ca9---lupeburasisozusovexav.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/5885e9d24e48589b31d3dbcea8f358c5/603076896.pdf
    • http://campcolefamilyreunion.com/clients/82065/File/pajegamugaxomaze.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001057d.bin
45940a0498299679081bf6135d4065521bcb3cc0e4c57c2518065fdf32ef80f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1057D 18472 bytes
font_01_sfnt_off000135b6.bin
a0c77d14ca1f6956bed5fb1cae73a935ca1d948738dc61f0b6f9612ae193b6fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135B6 17036 bytes
font_02_sfnt_off00014e8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8D 16792 bytes
font_03_sfnt_off000166a4.bin
dc7080a3893aa9d61458d06156357b9911c7af83a2aa47a526c4199d6112510d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x166A4 10836 bytes

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