Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc93607967d9bf4a…

MALICIOUS

PDF

86.7 KB Created: 2021-09-08 22:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d3b643fe67aed1e04e44b1ee34def5c SHA-1: c38aba3b157d53c166e3b8240e8459f378fd2db2 SHA-256: cc93607967d9bf4ae94092edb63a6cd95f9c9b05b2646452fdad6e99d291d108
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting it's designed to redirect users to malicious or phishing sites. The presence of multiple unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc5288d5c---90839284344.pdf In PDF document text
    • https://strategieb2b.ca/userfiles/file/49605075712.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/goxalibexizejesibebor.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/46313386204.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/47771239994.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/95400439389.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/xaketabipinupati.pdfIn PDF document text
    • https://clinicscrm.com/img/files/vizilojosuvajigesabuzi.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/monafubenuronupotiv.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/prkg9gojlp1hgv253cmc69mcah/80538369609.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/kigat.pdfIn PDF document text
    • http://sinoorchids.com/image/file/83882657743.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/37946934396.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/2892404698.pdfIn PDF document text
    • http://cga82.com/admin/File/80341653389.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/lexunep.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/dikasivojugomebelot.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/95504099296.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/towafupezivamubavipe.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/d6432abdfcd818f8ce8e56145adc0e85/96054530319.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/97401440317.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/90725879628.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/34257527107.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161304e90bde24---25201138594.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/fikuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=baixar+gta+para+celular+samsungPDF 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_off0000ed3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 18964 bytes
SHA-256: de84efe049c378dc825fe7bcb8995e92075d87fbac18027e4b3531c10bb4705c
font_01_sfnt_off00011b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6E 10852 bytes
SHA-256: 607aa5659e74103e9d3dc13172670f08032eebd1572f3e2a9622564e6236da5d
font_02_sfnt_off00013481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1