Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3773d18edac6ae…

MALICIOUS

PDF

88.8 KB Created: 2021-07-06 04:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3526fda1a409be84a16e583b53581e17 SHA-1: c6480859b86683087b9ff08bad1df4fa6477d6a4 SHA-256: 9d3773d18edac6ae809d9d0798123accc499945d57b810149dff9b4dd41cc75d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://catamma.ru/uplcv?utm_term=wife+birthday+wishes+bible+verse
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75733a13e2---21914299406.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/33598236e3cf508cb63c6977a5f88ef5/86660868424.pdf
    • http://goksirkrupskimlyn.pl/img/upload/files/ferajobosujagutaradukaren.pdf
    • http://villa-carlshorst.de/sites/default/files/file/lukidozewupenogidezozorov.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/584b6c85d1e7465b2127e61a6440b14b/43867830672.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072f08cc9fdd---90421411091.pdf
    • http://kaithompson.com/userfiles/file/belapidizivegi.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/a4c30f9bb749a43034619c885d80e7c7/48525588335.pdf
    • http://studiosaletta.it/userfiles/files/28444427404.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abdd03b2ef---fabazexesepotaloje.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/be92cc9f63aad97cc8af47d8137b4651/jixudegavowowu.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/c8508f263a02ffe1cbbea4acbf1552a0/81284045899.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d605aff7c---29616394214.pdf
    • http://omni-links.com/images/blog//file/zitijidevubewunadi.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fef064645d---mevaroxadefosofeb.pdf
    • http://jarosi.hu/files/file/livenabuso.pdf
    • http://rld-carbon.ru/file/37014964890.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/2tonsd5gkl4nld7j9gkodupniv/66784526902.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/jiehi6q2n9e4ejro2n04dp3io5/50134227676.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e2cb9bd23---69094528082.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ad9a005f2---39453982335.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fad3c8a4d1---28175498401.pdf
    • https://camgloberealtor.com/userfiles/file/rubusovikosebot.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/28vks100np5r633g5c9l2c8ag1/furivimosusojudu.pdf
    • http://apexnepaltravel.com/userfiles/file/75636000570.pdf
    • https://mytekas.com/UserFiles/file/vorutilaja.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fc15646ff54a71bb645486a72fb305fe/76678240811.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_off0000f8d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 16792 bytes
font_01_sfnt_off000110e4.bin
66f90de6f06e22c4be6ba8e2c9be6f65ea777a6cbd6af8ca0a135d47e85946a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110E4 17080 bytes
font_02_sfnt_off00013d17.bin
bac41ff7f9f9f56dd0fde9e71eae1781f344dcf79260b93700cb823313854256		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D17 10624 bytes

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