Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec73f4f53e63a6f8…

MALICIOUS

PDF

105.7 KB Created: 2021-07-02 11:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7f4a3bdc4d143e65a8ec3f0079085482 SHA-1: 7272ef13cd38d6c3ca5f366e24a1a89017834000 SHA-256: ec73f4f53e63a6f8a92f002548f1d70206b6d94cbbb68c237d4b49bb2f98fa49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm for SEO manipulation or to distribute further malware. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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
  • 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://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2d8f153cf---gilebamutubaxupomegemu.pdf In PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2kd4tnk69sdeljgmhl8eccrdu4/99594090785.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/upv4rr3vb78hlvj7en6ub26m38/murufekipigagemi.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e950c8dcdd11046236c7d9f136c432f4/75744050184.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/719e3754c4b1657f1fa7f64191e4058b/15369580629.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/qo901g5jpda35pstlm313i2t80/31968273487.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/asc609jsn7h1tn3uhhjt65esmu/pugibefagi.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5d3148fc8---xatamorudozuwemaguki.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dea99ab08---taparozekewip.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jemomi.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/322cd5e74bf150521955378f561082eb/buxalenerupi.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/47013974144.pdfIn PDF document text
    • http://camwater.org/media/files/makazewefab.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609de1945f3a1---kibuvixuzaw.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9ae36b213---namenarum.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/30702412308.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/61282778753.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/likasonirefivel.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/fff1fab712903144dfdfd3f0ef9b2e86/30835815675.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/75348742458.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a53613576---34613725006.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/naxubuwaf.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/1727898702.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/83565560363.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fbb5ec25a---fosizuxigatopokotomes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=2pac+dear+mama+free+mp3+downloadPDF 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_off000137dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEF 19564 bytes
SHA-256: d0ba9dbb088b730fd04440cf410b2a5d975a36a500f574e55e7d1174f5fccce9
font_02_sfnt_off000180b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180B0 10704 bytes
SHA-256: 47d7e73c1935496004e883f702c6c676070e919752abc91669970bae4ef54833

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