Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd579c4f5853634a…

MALICIOUS

PDF

85.6 KB Created: 2021-07-20 01:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8382a59a387bda12d79abe693878e395 SHA-1: b229741b83db5b3917c4f11c65e89e713b710a25 SHA-256: fd579c4f5853634aec164a8d7135c1c325d28599fd34eacaa5f804f9143423e1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external sites, many of which appear to be compromised WordPress installations hosting PDF files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to evade initial security scanning and deliver a secondary payload. No scripts were extracted, but the overall pattern suggests a spearphishing attachment designed to trick the user into downloading and decrypting malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b62ec3c9aa---76267919179.pdf In PDF document text
    • http://misosmile.com/upload/editor/files/kifikokejaxefug.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56676939ca---23511996691.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/mawavatasetatusisu.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/a42c18e388618a702464fa6e7556261c/dezawomezalizojo.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/sexonulelapapasinep.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/11561346782.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/0bbf63a9f449e9fec4789973e47f98d5/rakizifetodipi.pdfIn PDF document text
    • https://lapiadinafelice.it/file/1919413665.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/63209473220.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/32200066005.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/56f5e67b4cf288f91157c2322eb9c2aa/xabarobo.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/2021713225539.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cace8a641---sariw.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/66691641271.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/94359521628.pdfIn PDF document text
    • http://brukbet.com/user_images/file/37612631559.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210625_235028.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2d183dab2---4390336248.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/fotelenovedavakoxotibazuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+open+encrypted+pdf+file+without+passwordPDF 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_off0000e9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FB 17564 bytes
SHA-256: ba29aa738697b0914679868fa6cfd26b307968ab8b1f9b51b25850e03b733b78
font_01_sfnt_off00011778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8F 11008 bytes
SHA-256: 905ada648f23eca1bc6d0c4720d728a6b125d6850ebdd8ad65d3864d7a72eea1

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