Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0f33397d8aae93…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 04:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d5bbe5e02709097432005e6cfb1fbbf0 SHA-1: 1442e6da251e992df3ce4a35105da669face0e6e SHA-256: ef0f33397d8aae934a9c372fc07cc6ae16eb3cb7bd19ea0bebc5b46b89d4d91a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to potentially harmful destinations. The presence of these links indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6200

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077be8e9ac2b---zikadefojatuxavotup.pdf In PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/01806a9177864524c967e52cd335048b/52196783452.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/waxalele.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/kijajelokap.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/26394754887.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/nutazit.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/boxenoserezede.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb66021ffa---90044461742.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/wuwuvigutemunedobap.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/parigijet.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/tusovo.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03379d0333---zotudofefiz.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a191e85d486---72820936270.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c49b89672d1---63322128171.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4079288de6f17ec2dd010a2fa71fe75d/ponanakeruden.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/parilesugemoxetutaw.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/92647394620.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/kerenuzimer.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/xuvirakukuleloximemoral.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/53437093491.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb8bf68c17---kafewok.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609dacf0a04b8---55041128485.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/47155434405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=have+to+has+to+worksheetPDF link annotation
    • 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_off0000dd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD63 18572 bytes
SHA-256: acdbf46eb7550e0b30fc3aef6e58b874666f7a355e5a568d9f4ebaf614842b98
font_01_sfnt_off00010d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4A 10196 bytes
SHA-256: c824850632aea33c2afde94f353088b41c9556a5f8c489b66bcd8f51400ce216
font_02_sfnt_off00012465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1