Malicious PDF — malware analysis report

Static analysis result for SHA-256 92453354e83659ce…

MALICIOUS

PDF

225.3 KB Created: 2021-06-28 07:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1c7805ec58eaeeeecc171227c541dc1e SHA-1: 59f46d15b6b5d16763c65538904cbdcf6c932da2 SHA-256: 92453354e83659ce922923826cec00b2c04e6b9ac7c6e5f7ec2ee343c6bbc017
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with high-confidence heuristics indicating it's a phishing lure using an SEO redirector. Multiple URLs point to PDF files hosted on compromised or suspicious domains, suggesting a distribution mechanism for malicious content. Although no scripts were directly extracted, the PDF structure and associated URLs strongly suggest an attempt to trick users into downloading and opening a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://basaritarim.net/admin/editor_resim/file/rukomabetugitafibopoz.pdf In PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f3e666a36---68820230582.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/pajobewofa.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/93158200692.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2d98b199825016d3240be615e750180f/jigaxogiwifikaj.pdfIn PDF document text
    • http://schokobrunnen.com/idata/popegawakebexunewurati.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/94280704114.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8725805e57504c01b74746ff589194ed/nuwopo.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/4t29eh95t82vqpk41o6eslbhm1/39662290885.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/wigajenatowe.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/6c7be5f2839be41607c8374d8b7c0684/43892153776.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/96c1547fc6b579d58e3095fd8bd19bb6/pakezepidadowizu.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/bs94sout5vvgoveneml2chfq8n/wowebobisejeroki.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608119ca10d40---58681747548.pdfIn PDF document text
    • https://banghenails.com/upload/file/99607252275.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c16a488cb8---pevopukulotawirubuzadi.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607902e0b57a3---33716027722.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/tenozajunenuzibe.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/59868099655.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1621600954.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db2b351881---wexemeluzewag.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b132464265c---42383655762.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/21078833204.pdfIn PDF document text
    • https://clinic4lab.com/upload/ckfinder_temp/files/20210627011430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=anna+and+the+french+kiss+pdf+freePDF 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_off00031855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31855 18304 bytes
SHA-256: eae480c5c1dc059dbe6c95f8e4ef9e6bd0ff8b09c66ff6138a8fd045fd67fee6
font_01_sfnt_off000346e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x346E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00035eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35EFF 10624 bytes
SHA-256: 0ed221d7145483fcb1a622072b4fab2c7042acfad2fefa394a57d1f859334d8a