Malicious PDF — malware analysis report

Static analysis result for SHA-256 59db66934292d143…

MALICIOUS

PDF

92.4 KB Created: 2021-06-27 21:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0ce0633282fc6036fd32aee88d3bcd68 SHA-1: 64dc8854b1ec232868fd47c9fa16c9d6364253f6 SHA-256: 59db66934292d1438e5f8561a3a1bf222d66c09c4ef21b824913f5d419d9db71
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many pointing to compromised CMS upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b521dac1f---xaxufib.pdf In PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/24332463727.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/79247962076.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a22e7f10ca2---79846799594.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/r654dj9d159vjg0nd17pcen290/pagobiwosojejegasaxabumes.pdfIn PDF document text
    • http://palami.by/images/file/pelax.pdfIn PDF document text
    • http://markone-tools.com/upload/files/28941244028.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16dd0a6981---pewadanibevonad.pdfIn PDF document text
    • https://coevent.ru/upload/files/nidafudew.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8658f7f3be---gugezi.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/sebo3kj5e9a0db1f7305mt88o2/55094900542.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877b54d4609---lewosufowis.pdfIn PDF document text
    • http://masonlegacy.org/clients/61515/File/nebusox.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8e24874e1460e645f649e0d9af0fdd6f/jazatobe.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/276b5b53d08091d4b0fd28dfe5082972/32236565313.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/rp9av37bb0kr6877lhk7od370c/20432426058.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bbc873470---kepukoxejepu.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e188c45bd3a85ebb889d408541f090f/6489930279.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/93893601424.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1d7e44c67d30a4cfee3d140fcb894530/kebodoxopafotig.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/60533560992.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/45609669556.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/95a87417c8b34759b13c7e73e7a8ab68/jobajenudorativafizafapoz.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c0965c394---30629069055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+many+of+each+card+are+in+an+uno+deckPDF 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_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 10812 bytes
SHA-256: cf0ec481fa06a7ddbd1b22006143aa51c2df919c31706ea1fe25aab20538fe45
font_01_sfnt_off00011e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E54 17684 bytes
SHA-256: 84ad721889bc0a4201b99ef183b68827b1ccef96617d79c3721c5af4b0f1997b
font_02_sfnt_off00014c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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