Malicious PDF — malware analysis report

Static analysis result for SHA-256 643ecb8d13c768ab…

MALICIOUS

PDF

90.0 KB Created: 2021-08-19 15:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 715fdd412eeebf8d7c74cf86d44612e1 SHA-1: cd81bf6b7d581ff45a5f327d8944fe723723930b SHA-256: 643ecb8d13c768ab724e5ecd8d03f6dd201ea5ba4139d9e6b8def89436cfbc7b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to distribute malicious content or manipulate search engine results. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/3d2f1f7a0622a2989b1221d99fd323dc/68502825256.pdf In PDF document text
    • http://viethanit.vn/hinhanh/file/wejoliruwigusupavibiko.pdfIn PDF document text
    • http://centrons.com/uploaded/file/201114245860f2acda7d5d7.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/95041084327.pdfIn PDF document text
    • http://www.bandungmesin.com/file/90553468165.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084afa59edee---fegujufejamonisapalin.pdfIn PDF document text
    • http://contactconfiance.com/files/files/9164986180.pdfIn PDF document text
    • https://olterus.info/contents/files/tutirawifovov.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/xonawowe.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/16342663077.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c75db37c248---tefuzalitugogaxejuviv.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113ae0d26b88---nimasip.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb725b75fe---nonosuxedoniga.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/xupalori.pdfIn PDF document text
    • http://ducnhua.com/upload/files/watifutazizu.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/jewifulopidazavaj.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edb2d5539c---97528870584.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/m9ddtbi0euihqgdmhqd3slp7a6/54618784587.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/13901729959.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c22952ba82---87826178365.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/xadakuxinatuw.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/j594r2malbkq3mujoeqtvkk0o7/rolifalato.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/kasewuzuwokenemek.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/mku9cnm3nlrkgnqh9kl755rp11/fapedagal.pdfIn PDF document text
    • https://sce.tw/uploads/files/60c743cfb472a.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+much+is+scrap+copper+wire+worth+per+poundPDF 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_off0000fbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 10912 bytes
SHA-256: 466fd8de8025f586cc620c748c23d5f796c3b73f8f2a31622aa25e3f13a3eaec
font_01_sfnt_off000114e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF4 17152 bytes
SHA-256: 5d552936bb3b44a55681c77070450927fbadd2858290bea573bd3de9dc211cf2

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