Malicious PDF — malware analysis report

Static analysis result for SHA-256 859366f8191be9d6…

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 01:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d0204537c4e36d4b5d45224f1391b2ae SHA-1: f56f0414783c00c01cfc510fbfaaf8e28a49ff67 SHA-256: 859366f8191be9d605a9cf5eb57f07d7e6fd48cfde8888eec3b419d24f63db51
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of external URIs and link farms suggests an attempt to lure users to external sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://health-bridge.in/upload/file/pekokipivowunuz.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8auo9224es30bns5glvn9at9d1/wadibakogixit.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/95415778276.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613111f79045b---mabizoxawojoritifajoludu.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/68163057902.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/lilirez.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/lifoxalutakowun.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/90454025709.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/74557147837.pdfIn PDF document text
    • http://ipublicity.cz/data/file/36928208488.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/66406767516.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/47738402403.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eba0161434---91166210959.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/60545371942.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/75830218044.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/16607746067.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/bakinixoki.pdfIn PDF document text
    • http://ashioke.com/images/library/File/52357584607.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/fiwimetezurabipiz.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/c41bkhr4ga0b47feusptuct96r/26539808350.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/43026833910.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/21301521587.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/manikutokidezabex.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/13089104896.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/1cb91f0d3ad087985cfa9a079ae260b8/sefoduwoga.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/topimalawiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=gta+v+file+for+ppsspp+downloadPDF 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_off0000d967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 10680 bytes
SHA-256: 10b144328e15ac7e2ed72cdc32d373e3c6ce9ec154aab2bbc68c951146614d34
font_02_sfnt_off00010a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2E 18352 bytes
SHA-256: 614c22e3bd84986db15009c7466adb7e01d6c29c3e840125b75443741b1a35f2

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