Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56ced8cd18b07bc…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 05:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd27b54679e3c39986734e963a3565bc SHA-1: 1e00a716ab9e59b99386201b8e795a7b5286503c SHA-256: c56ced8cd18b07bc13dae537cb31ed268f9fa93aa88b4f570afd244714eed012
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains multiple links to external sites, some hosted on compromised WordPress installations, suggesting an attempt to redirect users to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade security scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crewmak.ru/uplcv?utm_term=app+freezer+root PDF link annotation
    • http://prttour.ca/FileData/ckfinder/files/20210904_DF6E4001B3E85EBA.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/98651368367.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/misifupobudekomuve.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/e294fa2a6f20df30a7c68f9a2da2c869/3569034192.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/danobijekifivofewo.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/85687771185.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b28c45e5c4---sisezo.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/30511744547.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/33765627441.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/menijiloxoxot.pdfIn PDF document text
    • http://nenorm.com/files/files/vumoweveva.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319fd5545d8---daluxokuxomiwoxi.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/83828785110.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ratafabivow.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/5ea13cdb0b70588d873596e8cea932b9/basojifodazededaf.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/4801027291.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/jexanojetomox.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/24685075293.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/kikilizonajepiwemu.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/vuzidirigomonat.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/12708882148.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/pidizoxiralowimozexovax.pdfIn PDF document text
    • 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_off0000de11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF623 18880 bytes
SHA-256: 3abe56b4d89e560688f9835c4c2dd738cf51f91ce48bc1e3a1f6bbd4337dc3a4
font_02_sfnt_off000127d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D0 9820 bytes
SHA-256: a56dbe5f297032b5aaccdd941021070db266039df72275d95d399c28d36cbe2d

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