Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea02133672e2e17…

MALICIOUS

PDF

102.1 KB Created: 2021-09-09 23:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 85bb6353f47fd93eb78ac0403b2cbab0 SHA-1: 0ac53f12111b3d1f435e962ec507991dc58e68bf SHA-256: 0ea02133672e2e17fd7f138f4afd7bd8c1e3e1f04eca7bc1b876865d83fce4dd
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified by ClamAV as a phishing trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The presence of a link farm pointing to compromised WordPress upload storage suggests an attempt to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3333

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134add87e1f7---87210675447.pdf
    • http://www.parinet.fi/tiedostot/files/pulazogafo.pdf
    • http://goang-hann.com/uploads/files/202109042029382504.pdf
    • https://mgrenginiai.lt/ckfinder/userfiles/files/tebitalodibifokojamox.pdf
    • http://checopharma.com/upload/files/14032897180.pdf
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/lonawusinenoruvamixeb.pdf
    • https://foodphotoshop.com/userfiles/files/vokokelu.pdf
    • https://pannonfinanz.eu/editor_up/81265038964.pdf
    • http://oipipleszno.pl/userfiles/file/6574766737.pdf
    • https://www.zochrot.org/ckfinder/userfiles/files/75183872355.pdf
    • http://dlzhrjd.com/images/uploadfile/files/tuwenivotag.pdf
    • https://tourpon.kr/FileData/ckfinder/files/20210905_9896357F03DC62E9.pdf
    • http://trubaopt.ru/content/file/mizowekojawuwuvimu.pdf
    • http://daiichilogistics.com/uploads/news_file/97440068580.pdf
    • http://bitree.ru/ckfinder/userfiles/files/selidilixemavuto.pdf
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/lubukoj.pdf
    • https://behbehaniprojects.com/uploads/files/jifotilidat.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376d3dd9ad9---65124495310.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/zexojid.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/39058461e72baf70c909707ac86b4ded/luxigeruwasobisorigadawog.pdf
    • http://thibangoto.com/app/webroot/uploads/files/98666748321.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/31107737841.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=index+of+series+two+and+a+half+men
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001481c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1481C 16792 bytes
font_01_sfnt_off0001602e.bin
a5d2b2b4ac9d821694695a1df74bba3e162a8d55f190a5cb62d0a41d100a1365		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1602E 19664 bytes

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