Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dab2f72ba7beee6…

MALICIOUS

PDF

89.3 KB Created: 2021-08-25 01:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b8e22fd1518cffdfe53c2388b00d96bb SHA-1: 0ebe113b0b641aefbaf096a553d9ec32640f4853 SHA-256: 3dab2f72ba7beee65223e379a0cb802aa6bcdfde3b650e9ee93749b9d92fcc26
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which are likely compromised or disposable, suggesting an attempt to distribute malicious content or engage in phishing. The presence of external URIs and the nature of the link farm indicate a likely intent to redirect users to malicious websites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://aaaexpressac.com/userfiles/file/zogifomaf.pdf In PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607af2d4311a9---49113937332.pdfIn PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/maferevo.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/74128699974.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/95663007377.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/30373624788.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/betefavaxuxumam.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/73801741260.pdfIn PDF document text
    • http://pestcontroluttara.com/ck/upload/files/75377032827.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/782a6fda153df773c1cdd3a56063c08c/kefelafip.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/3ad29d9514a18fdf8dbce7ae47fc3c68/lapirifuzodixafedi.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec094577c6---bezejuxipetig.pdfIn PDF document text
    • https://lecachet.fr/docs/files/17786848904.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160bc48ac05106---629149150.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdff2668f7d---xagilalajepodiwataxi.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/8q97setn72hn6t6p0krqng7ull/tulusuzamajifojinal.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/c7j8sau19ih91r6s3m9f3a2n18/rewozaxobejiwefaziru.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d81a03bf82---jelusudozujuk.pdfIn PDF document text
    • http://englishplanet.info/ckfinder/userfiles/files/dezuxekebopadop.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nufonuv.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/b13c01c52c26e205cc831c71879a449f/gisikonut.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/sedogunijamokikitizi.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/59735470019.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/d4b9e536bd5875d6d7d6f8417704932e/sugagijajavedagonowu.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c4398b00742---sutagorolu.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca12868cfe---60914116392.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e225ded4---zebogewuwilogasajina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=microprocessor+questions+and+answers+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_off0000f750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 10892 bytes
SHA-256: 67bd173990033e14640c401ea1e5969d576099ea0e3248a42d3dd947fb761d68
font_01_sfnt_off00011083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11083 17560 bytes
SHA-256: d227fb96280e63045df8dc7ed5d9f726c90a94e696bc48cc51ba7cdc398176a0
font_02_sfnt_off00013ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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