Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a30178c8dcf786…

MALICIOUS

PDF

89.3 KB Created: 2021-09-03 06:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c7625408bdc14bed6cf3b94a1c83a67b SHA-1: 66c5bd13b7b4fe2f8065818dcf68fad39e5411d9 SHA-256: 42a30178c8dcf786cf36fa4d368da78400b2268c7ae92e03b5506d4cb13055ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to numerous compromised WordPress sites, which in turn host other PDF files. The primary purpose appears to be redirecting users through a chain of compromised sites to ultimately deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=all+amendments+in+1973+constitution+of+pakistan+pdf PDF link annotation
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dbff0a718---sabibufaxawigata.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bd92b504a---kavapuzadagewoz.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b461ee00a9---5943942749.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b6326a153---67547993330.pdfIn PDF document text
    • http://apvn.info/userfiles/file/kobekuxudis.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/losowe.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/13177064568.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4af9c385a59b4d126e06e753000f9fd0/42033836692.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210817000838.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a949087d826---nijanavijenewiruxar.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/puvin.pdfIn PDF document text
    • http://adveotec.com/img/file/80213125112.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/43351588776.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/dadusen.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/45891452229.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/niwejibi.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/0bb380b76c48633aa78c8073429797a0/xofuvaroniribuzewapodomiv.pdfIn PDF document text
    • http://aweibel.com/Photo/file/bapefufosarebivo.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/c0868082f522cd5fb779d1cf9f9cea8c/jatonetuvezuno.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/84442217773.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8a9be8ebe---13535939980.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/zevuka.pdfIn PDF document text
    • http://amouage-salon.ru/admin/ckfinder/userfiles/files/leligumi.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/lakejujumetavilas.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/f71a8f6adc10a8e1b847f266f28f232f/titinidobawevemefe.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_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 11296 bytes
SHA-256: fefadebb1e67d3c44de0ede0f0924ee0e7acf84cdb14b04403056e00855189cc
font_01_sfnt_off00010b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AB 20244 bytes
SHA-256: 102ec8b391c09b5d52a29060002be6b654a45817e1e21f5a1361b96850dcd472

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