Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd0fc5686a6f324…

MALICIOUS

PDF

76.7 KB Created: 2021-09-30 18:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 30a29469e52e6aac7be55a543a6c61f2 SHA-1: 5aebea25bd9371c0e83e6aaeba2058a0503221c5 SHA-256: 7fd0fc5686a6f324e4955fff20ad0f41b3a5f193201c8251578d46394ff35d4c
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krantiservice.com/ckfinder/userfiles/files/66099348092.pdf In PDF document text
    • http://bluecars.pl/userfiles/file/kafawakemotofudovojixi.pdfIn PDF document text
    • http://dolonchem.com/upload/files/72292256492.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/32994675818.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/6940850540.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/10284385424.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/38828638592.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/vuwixor.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/nagegedezikivavejopupe.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16151c2ecc3a8c---wubilafitopukugeboguvefix.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614425794704c---35727621394.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/nabamilawerisalivu.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/39569098774.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/mozuretel.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/dupifojolafuruv.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/posevugutiwivuzorol.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142618e884f8---89735356203.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/55144998472.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109041348212949.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161421c3a203d4---66623242261.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/putosevonipulidiganegepu.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1614190e81ba14---vudav.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/91396653247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=headway+intermediate+student%27s+book+fourth+edition+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_off0000bf7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF7D 19528 bytes
SHA-256: 9e726d8bcaf66536bee93b4bf19e02350b7452133b929afd5d322eb2e787b2ec
font_01_sfnt_off0000f27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 11276 bytes
SHA-256: 5f0d5927d394b719320d5b74fd6356c7aa5126966c8afc482a763f5d69077c22
font_02_sfnt_off00010c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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