Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2845a25d7890f2…

MALICIOUS

PDF

88.8 KB Created: 2021-07-23 09:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 67777dac7d47fa4cbb7423c6f9b41d57 SHA-1: ab0343545e8812a0c499f23df9d313243448fe02 SHA-256: ac2845a25d7890f23baff1a055d6870edfe6ee52c6bbae4d6e9efdbe0ac7ff9d
236 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan. Heuristics indicate it contains a link farm hosted on compromised CMS uploads and disposable hosting, likely serving as a lure for malicious downloads. The document also contains instructions to disable security software and install remote support tools, suggesting an attempt to bypass defenses and gain system access for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085da6b0fd0f---rakibagowawapaxuj.pdf In PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16093e50139f05---5710265807.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160988fd0de0b4---61348095489.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/14948468029.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/87159462090.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/nufesunusamibuvikos.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/69634749656.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/zesezebarenas.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc026d72367---wetepumozepidupi.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/5c315fa29643c999a235407699a2389e/vezawuraxugoxis.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/di1r9rqhm5shs6m8nh18l2jkut/8637735553.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210609145420.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/72466769734.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609836e85f14b---23237168357.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/9pla0o9pd8a8maa1i28eopmn83/43217133740.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/58bd91ca0a189c80bc36e36630b1ca8d/miragajuvosoruxolukofat.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/fajexi.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2dd681423---22652419114.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/74322945518.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098df73438e9---62506150166.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/moninol.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/761d88b5b2013cc9ef9ea4f593909a9c/jozemu.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095b286c9cd9---vijagusiz.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/258b9853242650934d0ab455f61f7460/zesevodaja.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0673a0e20---zagatipudexowupamozataj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=download+free+autocad+2017PDF 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_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 10740 bytes
SHA-256: 2c2a509c71d6cfe9e2cd4c774ec38d57b9941a602cd8156ee75e01319bd0fae4
font_01_sfnt_off00010b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 18412 bytes
SHA-256: 13ca4407d35e806d903c714062b345655b6b7f877ccaf7fa65a049e81483cb2b
font_02_sfnt_off00013c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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