Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb29e0206f5b2f9e…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 21:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c65e18ee89741646faadd5c50dfddb7a SHA-1: cb9e3f08c4bf0679a86d18ae0348a7124694b74f SHA-256: cb29e0206f5b2f9eeaee299b5adcd5622832aa1e918063774499c1d0de358f81
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple unknown URLs hosted on potentially compromised or disposable domains. These links are likely intended to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://dental1970.com/clients/5/52/52cfbc2c58cc98a1938bca6351e90795/File/zijerotizaliponevi.pdf In PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/9ea1794e84f15986a7814adf7059bbd9/nedujibefe.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/93669284907.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/91505468094.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7145a5585d---32502544254.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/murij.pdfIn PDF document text
    • http://bonsaichik.ru/images_uploads/files/kimipokigi.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/7b229265962dfa929a5f353892b078a6/mibevololepupowular.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/41800486004.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/kalokewewubus.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/5172281370.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f99884e737b---pufuwejeralibixisabex.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a129e7846b2---45075714531.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/39731879629.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1609d50e4f3cc1---14447619549.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/89550065914.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021051510115677.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/32147468346.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/dulewivafotisavep.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8428be892---fosezinowiwagutomo.pdfIn PDF document text
    • http://proxima-design.cz/files/file/57760135412.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed3998bd98---bunomovos.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/2e916c737c320dcd53914ab48d08e894/33938676392.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/rawesofivetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ikatan+koordinasi+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_off0000dcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 16296 bytes
SHA-256: 76fa607f58a36f24ab4e8f5b4b3b62a344542cd9cf940a2e6ff171c33c2408c4
font_02_sfnt_off00011f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F18 10356 bytes
SHA-256: 403ddf860dbd580a10d2b8d09aae1be0669e62d293886980da718edbb55ab41b