Malicious PDF — malware analysis report

Static analysis result for SHA-256 13dc3a49aaed8b96…

MALICIOUS

PDF

117.1 KB Created: 2021-09-04 12:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 83ea1b4ee4f69699844f92bc207c7982 SHA-1: 8f41de0a8f22feb6fd1b272b184344942a392a2d SHA-256: 13dc3a49aaed8b96c85f32c712c0403fcf1290dfc24f3ff99610ba8df7e851db
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d128cd7d082dcbd89b499d87a20bd571/65239762640.pdf In PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/31377805217.pdfIn PDF document text
    • http://katachizu.com/img/news/files/79565697364.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/1858eb42aca524ca451b336b98494c53/84574254461.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160afa3eca9242---76467475275.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/vetogumumijozipubodog.pdfIn PDF document text
    • http://secoinblock.com/upload/files/jijiritamuxivasimudoda.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/kiroz.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/kinisaradeduje.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/1481854430.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/db4c1b5659c3831878600e40071b57b2/58117136462.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dca6a074fdc---fufiweturukabosune.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f79cbb6364---85114219498.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/c858ede7010c75a948835770ddf807a6/70612990853.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/fabewilatoful.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/4oacikbgvt4erqe5tmunp2t5b5/lefuxuvupibesevupigo.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/44092626028.pdfIn PDF document text
    • http://thedigitalscorecard.com/userfiles/files/99439485476.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/73708350828.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609290f6ef1d7---31856189071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=medieval+weapons+book+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_off00016293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16293 19416 bytes
SHA-256: 21d2941d884e02d9e3462a44585aa1bd8d3c98919bf321f8e7b2fb0321d46e55
font_01_sfnt_off000195bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195BB 10668 bytes
SHA-256: fd91e4d7b8ece975018a8b3eff60f0f6b086447dc649aa2a10ce60c4d449e4b6
font_02_sfnt_off0001ae19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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