Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3668fd8c5b30761…

MALICIOUS

PDF

68.0 KB Created: 2021-06-15 19:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6e05b4bc4dca827987b089fe2591512 SHA-1: 29689569bd5a1cb6fccc5a824eb31c4103b7b8b2 SHA-256: e3668fd8c5b30761d690c21ef6c858152ef6d295e5199f21b4a7234ea1b20c8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to downloading a PDF book, aligning with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=altar+of+secrets+book+pdf+free+download
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160740257b0bee---19433930748.pdf
    • http://technoculture.cz/admin/upload/file/gesorixitumurimapazu.pdf
    • http://adamlegal.com/userfiles/file/vuxisovot.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/hai5bj0e17a3iu7soch4vr5t45/sipimixibeta.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160745070b43f8---xizebemafewiv.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cb54b7064---87607854260.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/fvudtngj6bc37h0i6e19tollva/mipumalerenu.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1f2946373---74515959013.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/37223268285.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e1a03a977---polosojabi.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160935b52b908b---bezazabenimodakofepitesi.pdf
    • https://liniagdanskzydowo.pl/files/23275729067.pdf
    • https://nikosdimos.gr/userfiles/file/42046770548.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094a7cd863dc---64994061135.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/78556268347.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2798423c7---gonajuvowedunegadiwesu.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/e77a987a5183729d51cd743f2acc7d56/bapilowovusutowo.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/44687096649.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bab81d5509---45410498811.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb69.bin
d45d84da5a2f551066e56e9e3b0f9b033b0e0e8c3a5242301d837aabf1d7a286		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB69 5432 bytes
font_01_sfnt_off0000de08.bin
6849078562ee00a5deb5c86d7a255981d317f8bf2df87b7ac33eef4908d74233		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE08 10748 bytes

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