Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a948c27c1583d08…

MALICIOUS

PDF

50.2 KB Created: 2021-10-03 07:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13d057932f5e786afcaee9ddf96ece50 SHA-1: 5790c1b30043b9111ff915add184449c4779885b SHA-256: 6a948c27c1583d08cca1cf0c153e75f10c1cb9bb66cd8e2dfd2de22a47257a9f
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ML classifier also flagged the PDF as malicious. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to lure users to malicious sites, potentially for phishing or malware delivery, aligning with Spearphishing Attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8764

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.
  • 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
  • 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://maintogelonline2.bet/contents/files/57040420399.pdf
    • https://5974293.pasarantogel.com/contents/files/53921142846.pdf
    • https://phongkhamtamthan.net/uploadeditor/files/jaruxapanopejibarov.pdf
    • https://dichvuhappyhouse.com/upload/files/muzuvamo.pdf
    • http://artwatch.ru/userfiles/file/miwuxawemobo.pdf
    • http://psycare-spb.com/userfiles/file/bomegiwijagomi.pdf
    • http://ptktent.ru/userfiles/file/74937090039.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/398fcfa74faf9d1e1b15d0cdc40497e3/71315691432.pdf
    • http://proxima-design.cz/files/file/peruna.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/029bcdc463a83b617f45ff7733ed6867/96473464420.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161588056a331b---nufek.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614297e27eb01---pajanagemimerupol.pdf
    • https://rowsontw.com/shopadmin/upload/files/22624359216.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f6b1750d6---99527904565.pdf
    • http://liqaa-lb.com/files/userfiles/files/rofolepetunonovezefojipi.pdf
    • http://cafemsoffice.com/userfiles/files/15961693006.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f37a0b194d---96115795878.pdf
    • http://stellarp.com/userfiles/files/4983289141.pdf
    • http://abwingsjanaf.com/uploads/files/77898870908.pdf
    • http://cathyknightwaite.com/ckfinder/userfiles/files/87819881474.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/350086c1c85a8d6d6ef557af4dd9b349/81695259204.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614370beea1a4---54256598231.pdf
    • https://open-call.fr/uploaded/files/11916098602.pdf
    • http://chono.mn/uploads/userfiles/files/82559353819.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=city+easement+my+property
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F6 16792 bytes

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