Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a9ed179a75894d…

MALICIOUS

PDF

75.9 KB Created: 2021-09-06 05:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 97da5a1b5d19e57c8688eb5dc3dbf581 SHA-1: cecb5b3ec320f093b97db075f7f00f2549847527 SHA-256: 95a9ed179a75894d5cedf1b418f6843f368e115743c4d53eb96cd1cc279b12cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's primary function is to host these deceptive links.

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://crysiq.ru/uplcv?utm_term=splendide+2100xc+repair+manual PDF link annotation
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/93c3f03f31560372834d8dd52bc876b2/88745677835.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/vesakif.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/pinuzepapafunilun.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/35664441508.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/fba791b9128a50e2376587d99c7f515d/gerad.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd7bf0d37---vatinulelegaxev.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/93820540559.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/kerukumiji.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/4be5120bddb6ecc304b055a172658b49/57270148637.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3q17ljtipjma2q58qp5oap2uac/85506267244.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/52739761204.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097e37be0723---67931799526.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///91144098749.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210725163345.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/fitakepupuxid.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/693833dbd011df3a519211e30107795b/lilotafidudezopep.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/02962698724f0e6dabc91f002c620aa3/gogozijivowezizekogunuka.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/dd07da6cf9e7d4e4913b52ac1334ca07/23233654121.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/410a9a01f396f15e47188aba8c08dada/padir.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/xinatedajevamalozatape.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/89973118f3e66ecb03ca63c2212edd7c/fajuginoxagirox.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/bunipovup.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d86e400dfc7---pejufulolakeriko.pdfIn PDF document text
    • http://esistore.de/userfiles/file/75574776694.pdfIn PDF document text
    • 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_off0000c9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E5 15280 bytes
SHA-256: 723db091fec6eba6ca35bf78b096b3bef03103b9078c996ff170d4d54312f326
font_01_sfnt_off0000f098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 10860 bytes
SHA-256: f537d854d567359a6b6cd3accf59a29acdbdc7fac4e48e6d2d283a4fa85713fc
font_02_sfnt_off000109bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1