Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7040dbe67f9c237…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 23:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 60057019605836ef927d996eb5fcf197 SHA-1: 48d1c04282da520ecb665837f14d60e3610ccb9a SHA-256: e7040dbe67f9c23718d0fc9ef145594792b6340981495376e44e91ccbe2dd1d6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into downloading further malware or submitting sensitive information. The file's structure and the presence of multiple external URIs strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=pipelining+in+8086+pdf PDF link annotation
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792d1b5208b---joxevevavaweteramotapuz.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098df0386910---34816626199.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d56c85edb---piwosi.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/jajofemaponopinunexo.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/72787625689.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094344250c0a---21031905140.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/naridal.pdfIn PDF document text
    • https://soliangco.com/contents//files/30586008409.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/32595559515.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/xaxivafadodilewajobiji.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/45269021413.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/mexizadesonoli.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/turojugilenetawavatosusal.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/wexizeze.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/piwoxonefinowubivizujiwi.pdfIn PDF document text
    • http://weingut-suppan.at/files/69988545154.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609681781c858---31697732486.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/kinobodu.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/nafugazanojowixilitawuda.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/cvr03fmemu2d61q5q8gv4cvn04/kabaranudotomatasatoku.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b20f105c720---84980187715.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090d94c893bc---79279344304.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a92751d75e5---38751863904.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/jiromirejuzudorepavera.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/2774166620.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_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 10524 bytes
SHA-256: 96ba73b26fc89ce85081e6ad2c500900c07e89f677b77750ad8487c039cc51d7
font_01_sfnt_off0000eee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE4 18096 bytes
SHA-256: 61c15d7a2b7e793a994116f222b106807cbad50a850f592e93c82e92eb059d89
font_02_sfnt_off00011d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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