Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca8755c8131a278…

MALICIOUS

PDF

120.4 KB Created: 2021-07-18 17:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a4b701c4fddd677ecb3d298802932b98 SHA-1: 54c408ac64f85d962e52be4a542804d9b2d66f2b SHA-256: 7ca8755c8131a278148321f7b84fa082060bfbe07f78be3819f3f31b453b5592
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination of these links. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160847e49ba8be---temazubobidaxe.pdf In PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981409c5f8c---60060659505.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/mipitidepejiturewa.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/nolapunusirakolas.pdfIn PDF document text
    • http://ubest.ru/images/file/84838670279.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/xijinirej.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/jividaguzezukepif.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1881a9a01---negedolojafapugegakir.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9c5cee06554320cc7a7769b56d5cf702/pateniwifezulufakireg.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ab33d858e6b38aa13380f4922d4139d2/valuxegefedusivomasa.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/0s5f282idnefalmhihhsvrf0q0/97365041845.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/fixululojovogititeju.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098666ef320e---83063533730.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d411dc05850---84989571907.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e53b485f74---xavagadiw.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/37252355900.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608767838a5eb---63982029951.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abec365c34c---nowodew.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160794f5f41274---joxedekatosubepafuva.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/764a707f6bccca51a1a76e1dff37b576/xajogirufi.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b434b366e1e---xiremezowodidaku.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/91360487060.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/62556878067.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160803c9e9b8e7---gamevuwafoxoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=persona+3+slimePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001073d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F54 10344 bytes
SHA-256: 2089bc0de3e5c8969ec1849fca7c7cb7bb0e33a851d1e4902202445e05432acc
font_02_sfnt_off00013699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13699 39460 bytes
SHA-256: 5a1fbb75cf10feeaa5d8f54c089f54e5b630be7764f219ca9e73514bd2b27369
font_03_sfnt_off0001a577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A577 18832 bytes
SHA-256: 9acab19bca0640fe2987edae946c12029e2685ae1768c76be11999167e8226e2

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