Malicious PDF — malware analysis report

Static analysis result for SHA-256 9440a7b9bc086484…

MALICIOUS

PDF

84.5 KB Created: 2021-10-09 09:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 36866999803058ad6a597c2dc1db6e68 SHA-1: dca68d5b5860f27a665af6389e9db8f44023cca6 SHA-256: 9440a7b9bc0864846251f7346d3aa8f46d3edaddc9f24952864e3e70b4422fbd
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to domains that are either compromised or appear to be disposable, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple external URI heuristics and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://markaoyun.com/calisma2/files/uploads/42377243320.pdf In PDF document text
    • http://sushimura1.com/uploads/files/bunaf.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/9f9f20a04883a681ab6f702368830439/11776835180.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3c64ab90a---xefazanutup.pdfIn PDF document text
    • http://livilgirls.com/files/16451148210.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/matano.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/degibazog.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/o0r52fjdn5fg1n5nrfc4to4io5/67382144502.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/89438554207.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/nunivotifitowafa.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eef64acf51---zelofidilibalaja.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/8845020783.pdfIn PDF document text
    • https://blv.by/upload/editor/files/saxal.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/47805628494.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/1ea28c7dc56dfb27ef1eca04bcaecf71/kowisijepodiziwel.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/vadejinefafifabesawas.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/jufapive.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/podoboxunodemadabi.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/19273039592.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/zimowogikopuzerose.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/73743876607.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/butofe.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/40844846830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=cognitive+psychology+and+its+implications+pdfPDF link annotation
    • 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_off0000ea87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA87 18456 bytes
SHA-256: 32f82fac09a126622727bdddbebe9d053ec51a8b6eeea5c13868c4dffd2bb367
font_01_sfnt_off000119df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F6 11180 bytes
SHA-256: 1890acb83d0488b111cf20e1403d45fbd4406a01f6ffca182da5e9993ec5ff42