Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf513fc8a673381…

MALICIOUS

PDF

77.5 KB Created: 2021-09-14 03:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c0160c746323d87fe6308f572d95693 SHA-1: 7f746b0b09d2f788db710e7cee696c86e7b214a2 SHA-256: 5cf513fc8a673381c401a08271e1e67985b1e1560e8a09e10e731cac86c4de8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous URLs are sufficient to assess the attack pattern.

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 http://mptech.vn/ckfinder/userfiles/files/25059459558.pdf In PDF document text
    • http://ssatripoli.org/userfiles/file/rukizubajekimo.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/sanadawaveguzol.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/79803774473.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/mamukibazilopudidevesivij.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/keroj.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea938e28de---xokobusunatadopamazisa.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/bifedagilavomi.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/wodenokofebera.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9bfc1b258---33609830842.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/56896710378.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210909050520.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/lodatobagesomeduje.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/soboruxabibotetorojimusoz.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/vabusesojesitatejumugixe.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ef1257dc4---vowemafukegatefugujomig.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/siwowabesifubejarugogok.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/nexepawowapubipasobemu.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ujcnpo36l2vplj1dlu98n3e4ng/11241754049.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/51611548348.pdfIn PDF document text
    • https://webmenuplus.com/images/file/fegimexidikini.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/vamukixajanefilamixa.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/biwijifun.pdfIn PDF document text
    • http://portableandcool.com/files/files/84179108340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pratiyogita+darpan+monthly+magazine+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_off0000c696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 18604 bytes
SHA-256: a12d9df59b45376c4b6cd4c19bac4418900f2551854dd8062cb8bf01498d186b
font_02_sfnt_off00010f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5D 10952 bytes
SHA-256: f1a4b36a2f4613e5b242da4f3d08f20cfb111e3fd1638f833e4f6b0b9b8d74fa

Open this report in the interactive analyzer, or submit your own file for analysis.