Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4bda1350a03b5a…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 08:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1edd5492648e9e0b73c49cec77f656f8 SHA-1: 00377ec92d49b2a876825991a46c97ec321a1703 SHA-256: 9c4bda1350a03b5a5fc51a17c7587992109fa9c3c81b13f16c3af00be8836ab9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. While no scripts were extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/lusajukakeroranaseg.pdf In PDF document text
    • https://infrastone.com/userfiles/files/61431742578.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/wivusis.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/43855227695.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/piparavagogonipujexipaf.pdfIn PDF document text
    • http://kustari.net/userfiles/file/31205319925.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631052052.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/pagixanotukosagajizo.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/8d4fd5f7502cce02d32d72275167ed7e/39197826753.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/bukot.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/85879868779.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/33585755082.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/5f302ab1dfafe2eb21bb102574fc6843/27645628020.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/94d5b1c9c7488f971890c078e9b7ba1b/42173054855.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/33988374456.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/kodijesovi.pdfIn PDF document text
    • http://fgosvo.ru/files/files/80911010524.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c5de8ec048c9dc61229f28eb239e5e03/pevudimudugufalomasajezo.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/83140121486.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/duretan.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/c42163b2ed9cd80b7cf5c06b6f729cd0/xoseposomemiviza.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/nigatotenorivanekepek.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/turarite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+take+screenshots+on+android+galaxyPDF 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_off0000e138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE138 17480 bytes
SHA-256: b995d1f0ac4f170a37f8c96b4f604178f719d97e44c0d3d19c27a18d5ccca362
font_01_sfnt_off00010e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12667 11036 bytes
SHA-256: 704919919514c5d0839ac5ab9c58316c0a12b44a196052117f0eb78a083782b0

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