Malicious PDF — malware analysis report

Static analysis result for SHA-256 d00ec98eff4c39e7…

MALICIOUS

PDF

82.1 KB Created: 2021-08-26 12:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2be169121d7298a5a6ef5feb17e72d77 SHA-1: 0565570bd48e845ca933519f232d991823b98fc6 SHA-256: d00ec98eff4c39e7ac1b34e5763a9e0c08e1f62e9b04c079b6a19a911ae0b986
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised or disposable infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm on potentially untrustworthy hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://psfund.org/public/uploads/files/cms_files/40118425667.pdf
    • http://mulherinscampground.com/clients/879992/File/4099277389.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/1d64eec6d68d54d89b300844289590c0/redemanedem.pdf
    • http://andreaslasnik.com/data/files/logapidukolidupivumorute.pdf
    • http://lindendirect.com/ckfinder/userfiles/files/54458297762.pdf
    • http://mysistermyfriendministries.org/clients/85776/File/dutajugarasaxoxuboro.pdf
    • http://maychamsocda.vn/images/userfiles/file/13137079737.pdf
    • https://ags-car.com/upload/files/komorova.pdf
    • https://phatgiaolongan.com/upload/ckupload/files/xezidavosopow.pdf
    • https://strategieb2b.com/userfiles/file/wazap.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070ba77aa690---wumamiruguwasifutevasa.pdf
    • https://pima-alarms.rs/slicice/file/manosat.pdf
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/biwoke.pdf
    • https://valstybestarnyba.com/upckfinder/files/73671928436.pdf
    • http://murielbellhomes.com/userfiles/files/jodibafino.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/n3nes0hq99jm42f3p2mtpp4r8f/gekexovedi.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087402770c07---doxagi.pdf
    • https://cottingham-group.com/cufiles/files/45327646119.pdf
    • http://selfmadefilms.nl/userfiles/files/23722411890.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d561f8a77ff---visubogavu.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/45b605c199adb3beefe02e90a27398a4/mifiwelakewubofubijudiset.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095f7e37ecd1---85426026332.pdf
    • http://klinikoral.com/img/userfiles/files/79665130067.pdf
    • https://nikoljski.com/ckfinder/userfiles/files/96110614118.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+biggest+ocean+on+earth
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBA 16792 bytes
font_01_sfnt_off0000f6d1.bin
7e82ce8d23fdbf57e13bf8c7de065bb43058c59227d6099f4ed9b540e6f70f8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D1 10564 bytes
font_02_sfnt_off00010ee1.bin
5d6a809c65841dc91a55bf125fc7f89371e2bb33d78ca41a5b20ee488fb8038e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE1 16600 bytes