Malicious PDF — malware analysis report

Static analysis result for SHA-256 817175bf03079762…

MALICIOUS

PDF

89.4 KB Created: 2021-09-02 16:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 881b7e07cd453f43e57e969847d3838f SHA-1: 27834812056a4f8329ca8fd0070a2febd17d6d9e SHA-256: 817175bf0307976268c0a2968603e3cd1ab38a610f48e2a8b52f134ae9a0e848
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. It contains a link farm pointing to numerous domains, many of which are hosted on disposable infrastructure, suggesting a phishing or malware distribution campaign. The presence of external URIs and compromised CMS upload links further supports this. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketex.com/trcgp/ckfinder/userfiles/files/36268387577.pdf In PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/gigajejogonesivevopodufi.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/tdfn0qmrepd36lqp68prtlgfd2/badonuvojiwu.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607100ebce4ee---37055786418.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b6e11921423a435dd89c17be72733528/16864947473.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/lasivi.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973274d31bc---mazogum.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/2878365657.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/66848093661.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/79b0fa556d7e09e9ef450b8829f77101/jusefewubigopusoj.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/libixefopefedejigubod.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885ebea80e2---jozemekojagumutilukepig.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c4ce1fc53ab11088877040e4cb7a8f64/kibevaritemitukusatulumuk.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/84329416095.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b06aa2796bd70e5780029ea7d31bc382/72138825400.pdfIn PDF document text
    • http://digifast.cz/userfiles/19123963318.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/gkbv11b4jusi3lbdge3gd9v0do/numufapupi.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4596adf0b---nazogawe.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/jomepupizejug.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/fedidabokerubovofopotole.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/82f5b34e70e79f95c167a5a779e9e334/79359302454.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/63568847949.pdfIn PDF document text
    • http://dzbnf.com/upload/file///xulewetuviwukini.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/jemarenowofefekuvomadeget.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=milrinone+davis+drug+guide+pdfPDF 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_off0000f823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 10732 bytes
SHA-256: 802b73321c0bece1f0d0dafd873e5c137f70302c00ac9c2406c47122eeb76b87
font_01_sfnt_off000110ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AB 17864 bytes
SHA-256: fa61d89405638964ea5d5bec66d2e8b3256044a9864528bd96cc4560f6452958
font_02_sfnt_off00013f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1