Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a393dcbfff7166…

MALICIOUS

PDF

81.9 KB Created: 2021-08-15 13:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 24a58b97dea0d9d115fba981e078aeda SHA-1: 8eb894669d0e2f20b2c6752a2f24f8b5a1ea0391 SHA-256: a9a393dcbfff716672ea3117b7411b908c77adf6776383e52fed99fd88646706
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 ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely intended to lure users into downloading further malware or engaging in phishing activities. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://alharithiforcameras.com/ckfinder/userfiles/files/1219997768.pdf In PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a4f68ebca---26032850166.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kcr5na372q8d1fdk4vq5ah15p7/4105232380.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d625593190d---13434653216.pdfIn PDF document text
    • http://asfalon.com/__files/file/zubetetazubiwebowazogilil.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/h1d0e5d5edi0ig5jiml5ffgmoi/72353672725.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607266a437b8f---lonavinibelij.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-16/20210616155629925086.pdfIn PDF document text
    • http://rideco.hu/upload/file/93787112243.pdfIn PDF document text
    • http://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/61136751397.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/6cf7403bbb89471cce67836507810dcc/faserelaxezugimafexaletu.pdfIn PDF document text
    • http://llux.vn/uploads/files/jizavopijevakavuguji.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/vm6l9o85agiskbh91aou1532vl/ruwolawinemop.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/kjdoujrkounat0o9rdunq84u27/fogexaril.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/netedamo.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/18610365822.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/8f808a1050eeeaf1b889b00bbc52a412/fejafawojiv.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/55829413105.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/e5e94ef7ab96ea7ed422bca9cfcf2fb2/suvobudilonukemule.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/87988138881.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/8166446a90e92c4d9aa96500510586b0/29620374146.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c7ccfc4bdf91d34071f6cc746409fb52/nixupuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=el+alquimista+paulo+coelho+pdf+espa%C3%B1ol+completoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF31 11116 bytes
SHA-256: 9b7f395a84b0615fe69aaa877c1ae9eaa6d4f1ea7550e38b6183df0c16079133
font_01_sfnt_off0000d8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AD 17192 bytes
SHA-256: 85570b09ef558ab99de34488036db73bc6f72889911632f47bac7e7dbb7984ea
font_02_sfnt_off0001042b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 17720 bytes
SHA-256: 2aeb847442bbaac3d319c217acfaef24e391180e66b9f1a9cc42787f98d6b631
font_03_sfnt_off00011f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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