Malicious PDF — malware analysis report

Static analysis result for SHA-256 554388cdfc3357e2…

MALICIOUS

PDF

90.3 KB Created: 2021-08-13 02:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c6d8e2a7381d5e4a7bdf0db158e3bdc SHA-1: 898d7c677de89caa51da2f702c4bb4f028dc6b98 SHA-256: 554388cdfc3357e2a1ebdf13cb5e7efa056eb23640f85f0342be7fa303b92617
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as 'Pdf.Phishing.Trojan' and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd766a2697---kaxilowanudozanifibulu.pdf In PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794f8c3a9e9---74566129532.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/66113690738.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/69865250917.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210715_C0F1DDF1C8AA21B7.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/3497245f09359a1544483a25e5a8cd9e/gezad.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/bokorukekelamipukug.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abfec8eb12---84474140018.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e668b3e1a1992df2d6a687030159c35/xesifomu.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc46e193adb---xapagugopadamoziwabaga.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/betesa.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/4650f4eba0d8a0a96cf59ba2a979eb6e/24001717587.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/92266914857.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a06d0e42a---21957702958.pdfIn PDF document text
    • https://mmszke.hu/files/file/66003773221.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd406b009a7---39648808537.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/80310040037.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160bfab326a7b5---2738238441.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914d0da4a9c---kamutekavafi.pdfIn PDF document text
    • https://bmat.mn/uploads/ckfinder/files/nilejomo.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/dirutepadebesimelasuw.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd14bb262---felatojolusuzafusuki.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210614194942041145m6r5f.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+learn+technical+analysis+for+tradingPDF 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_off0000fa66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA66 10944 bytes
SHA-256: 7058e888a832ee4d0b5f53e0835db5435f5be14c9cce55b990b7522fae26d08b
font_01_sfnt_off00011383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11383 17296 bytes
SHA-256: 6d7c6f97525b1a03d8b451df121d219945e2acdb2fd1a9b7ac2bec800ad3dee2
font_02_sfnt_off000140de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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