Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ea88d69bf8bf75…

MALICIOUS

PDF

87.2 KB Created: 2021-07-08 08:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a32a5584ee840fa2773b54510ecb8798 SHA-1: 1c6648af8af0c864119d3d04fd86614ee204de1a SHA-256: b7ea88d69bf8bf75270a6dff727015995f91c5e57bbf366f96b78653ccff9799
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to direct users to potentially malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/0psk3uamru457bb6tqpu7l146p/lubixifirukogodowitupa.pdf In PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/57fe55370470cb8487d74fc7c481df05/vikajuxavamanepixokizuz.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/zaxexux.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/44740817681.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e367604b5---67702380717.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/semiguxetagisuripobozi.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/fcf2af9d3393eca8d6024ddee31fc42c/pamasojit.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/wutew.pdfIn PDF document text
    • https://cargotavio.ru/files/file/detekutenogekutudinolabu.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/25336314792.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2ebf9519c9---bubituseniserovazuvivora.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607616e11bd54---81145559272.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/83063986721.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/5bb494f79d79ff8cc32dff9a4fc37b1e/3448800631.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/nemewubegaropifetizavutar.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fea26898e---79243372344.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8b5bca8600757de2e0df250cb8f4d5f4/94040328079.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/d574430dcc57a093d57a70fc71cafcd8/49518637393.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/6bb943f95c74dc1bc2531b22e7ad67bc/93591081377.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/6t1kb7c43kq4dfrd1o8t516s05/21261416700.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/zexosamemidarakogim.pdfIn PDF document text
    • https://noddy.nu/images/file/99820499502.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/gakifireto.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e2621a9fd---7944682705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=are+pistachios+good+for+dogsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D3 10732 bytes
SHA-256: f4176065e2b3a0dc1ff8d15f18cbc4e29df73355d374eaab1cd58de1e9b008c7
font_01_sfnt_off00010b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B75 16448 bytes
SHA-256: 1e690ea46d82a34fc647a75b189cea9376679968374cbb7886767680285e6633
font_02_sfnt_off000135ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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