Malicious PDF — malware analysis report

Static analysis result for SHA-256 441032b9a90aa5b6…

MALICIOUS

PDF

289.1 KB Created: 2021-06-26 04:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b593528a7ece915f61a135a914e0b34 SHA-1: 4ef054661c0fd2f1fe9ce276f2ace71de9a5c718 SHA-256: 441032b9a90aa5b642979219fed7ca0a93dd939b173dfd1611d780e516e29636
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ML classifier strongly indicated maliciousness, and the presence of external URIs further supports this assessment. No scripts were extracted, but the link farm heuristic indicates a high likelihood of directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

Heuristics 4

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=the+belief+in+many+gods+is+called
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fea29835d---64613412732.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6ed44a37---wosed.pdf
    • http://thegioituigiay.net/uploads/files/darajatit.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4e89ab948---lifumurerafalawenavo.pdf
    • http://primebrokeragetx.com/ckfinder/userfiles/files/gajodu.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d3e59d7dc---totegasarisopuzinon.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bd9520eb8---vedinapofixekumo.pdf
    • https://vijyaiprismcrm.com/userfiles/files/32736774555.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4424478743---57954883324.pdf
    • https://tycoonmarine.com/userfiles/files/11228976804.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/be91b6c30eae9c3b34062fb8a6be000a/bukenapidotage.pdf
    • http://placc.info/up_image/lolakokawozanirutojojen.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b82af35144a---fevatefonex.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160767d7f3cfcb---47613869480.pdf
    • http://softwarefactory.nl/images/file/juxuxoxule.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160acf1c4089e5---denijinupurozov.pdf
    • http://cn-junsheng.com/upload/file///2021531114333787.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/4050163ae09f6335630043971504b948/dabilavaximoravode.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8034372fe---18622987406.pdf
    • http://ahxxzx.com/userfiles/202104/file/norikavelomarabu.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/b2d8dbedac4c80c3a50d6eca0de34263/95087783858.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/3416808042.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00041429.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x41429 16792 bytes
font_01_sfnt_off00042c3b.bin
5691d65b4711d26ef79be024db430fcab23af423de32ffb89f863593b90834ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x42C3B 18800 bytes
font_02_sfnt_off00045d3d.bin
2ef56b00135daea34b76b2c0417fddcb65678d9be3d61dab9273ada362d67105		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45D3D 10944 bytes

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