Malicious PDF — malware analysis report

Static analysis result for SHA-256 00f70b2543358458…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 05:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 808d6159406188e62dce104da6d97451 SHA-1: 1673179cc9d4a54b47946eae8e2b3777a0665719 SHA-256: 00f70b25433584580d6c63329a35818746538a69e13cea58b56956669cabf041
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier, containing embedded JavaScript. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded JavaScript is a primary indicator of malicious intent, likely used to execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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
  • 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 http://railwaysrailroads.com/upload_files/files/52175156726.pdf
    • http://madmojo.com/fckupload/file/fukewe.pdf
    • http://dainindo.com/Uploads/userfiles/files/87073856857.pdf
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/notomopamaxo.pdf
    • https://sandp-engineering.com/ckfinder/userfiles/files/riralidededixoxasukapewor.pdf
    • http://metabolitplus.ru/files/file/lotulenusavu.pdf
    • https://autotronics.vn/userfiles/file/16963968739.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136de4340ab9---4946031896.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131ac25e8bb1---64765162468.pdf
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tarep.pdf
    • https://hongdung.vn/ckeditor/images/files/ziludakog.pdf
    • http://trieuduong.com/images/Download/kivasugizedesugonulatupiw.pdf
    • http://kasintorn.com/images/upload/files/56938872043.pdf
    • https://trexanh.net/upload/files/48721781926.pdf
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/duzetoxoxutifeme.pdf
    • https://clumba-indoor.ru/files/files/bijuxijeg.pdf
    • http://hoangduy.vn/vn/files/79617566373.pdf
    • http://westhollywood.ilovepokebar.com/uploads/files/pezodal.pdf
    • http://aallergy.friend-match.com/upload/files/fenimidujekasimu.pdf
    • http://namjapizza.com/app/webroot/files/ludilu.pdf
    • http://veoguidecostarica.com/ci/userfiles/files/99671452411.pdf
    • http://euro-ex.net/images/blog/file/nemafosikinalivavidad.pdf
    • http://adance0112.com/upfile/editor/file/97491830044.pdf
    • http://studiozoppini.com/userfiles/files/39060091249.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7de1b20e1---33982046787.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=goat+simulator+mmo+mod+apk
    • 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_off0000da04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA04 16792 bytes
font_01_sfnt_off0000f21b.bin
ef4940e9f0a63d7d3a6d16fec6627eacc4de736ea42208b4af89593bb160baa5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 10548 bytes
font_02_sfnt_off00010a2b.bin
d1cc812b55660023504d31c7d3a0c5b4705721c89601c137e5efdc3fa16ea0a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2B 17200 bytes