Malicious PDF — malware analysis report

Static analysis result for SHA-256 40541dfa9e408204…

MALICIOUS

PDF

83.8 KB Created: 2021-08-02 19:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a773d61a43643518bfdfd2ef1dc27817 SHA-1: 8759f892185b96fdbb66a1fae2d73517b29e41a0 SHA-256: 40541dfa9e4082049467390f3eae7f80f24c42bccf048bafa6090c780a958fb1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. This suggests an attempt to lure users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ae91e770f03---kubozubedubidatos.pdf
    • https://prestinireedcorp.com/userfiles/files/99196629926.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/g1urof4seisk1n4oaevj20v8tc/4255530609.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609409c529ee6---79336838220.pdf
    • http://satunatc.ac.th/ckfinder/userfiles/files/24358726301.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/d2c0k3iongqcku26o7linghlp3/kivemiboxedinomet.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b107cea1e2c---79751576457.pdf
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/fimuna.pdf
    • http://seyrimerdin.com/userfiles/file/kutuzodijiw.pdf
    • https://imahima.xyz/js/ckfinder/userfiles/files/33035017989.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/f0b0215ea534ca09ac826f73bfe1d74f/49206833140.pdf
    • http://danguykhoidoanhnghiephp.vn/Upload/files/13158470906.pdf
    • http://linza-market.ru/upload/files/89407523528.pdf
    • https://ludifrance.fr/userfiles/file/22231879809.pdf
    • http://smwiarus.pl/ckfinder/userfiles/files/2566341080.pdf
    • http://telmeed.com/web/ckfinder/userfiles/files/wotudepukoxekeje.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/91969bd69cf36ddc03c0000810fb5bd9/pipifofer.pdf
    • http://kraski-chernila.ru/resources/file/78353258137.pdf
    • http://rafaelokazakov.com/file/nukunol.pdf
    • http://salinasouth.com/clients/11073/File/xopazafura.pdf
    • http://henri-ruch.ch/doc_pub/file/dunijawetojumugibijidolex.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=can+you+duplicate+a+discord+server
    • 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_off0000e52a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE52A 16792 bytes
font_01_sfnt_off0000fd3c.bin
063b335952fa6c5999ba305c2b2d943f6d1168c88965c9b27d5b82ad05a8a2ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3C 16712 bytes
font_02_sfnt_off00012871.bin
afd612485571f8c81d367c24c0e37baeedcee0c186dc7b883cd0a8cf26953bf0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12871 10820 bytes