Malicious PDF — malware analysis report

Static analysis result for SHA-256 4308ff14f86ce19c…

MALICIOUS

PDF

75.4 KB Created: 2021-09-06 23:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3559f68f9fa4f5d23a7022818ddc5f94 SHA-1: 855cf7a8fb92cf2b101d26fb45aa9358929a7c80 SHA-256: 4308ff14f86ce19cef9820ba592896b9623324f6f3bed72f3a73b52fca15128b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • 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://almuhja.net/ckfinder/userfiles/files/tazoxinigenuseki.pdf
    • https://astefin.ro/ckfinder/userfiles/files/62630726242.pdf
    • http://tunesistudio.eu/userfiles/files/winotajarudusixetudufit.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/h7dtq5qta96bdm9h08m8nbkbf8/89926166262.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/aklqlos7vkn7j0ccjpmkgs02c7/87336801008.pdf
    • http://lnyuanzong.com/uploads/files/20210719132154.pdf
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/34780719534.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e67759e82f---galixoposewafi.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/segoxokitemojudusagi.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e7bae5061---39621162382.pdf
    • http://bocghedanang.com/media/ftp/file/72012098514.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0c686a3fd879a08d6ed27eb8daec07e3/dekiniginejujinese.pdf
    • https://comiconfezioni.it/file/fupuved.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16094089b8c13f---47310068343.pdf
    • http://genbreedpublisher.com/files/upfiles/file/22141390124.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/5d42bvpc357ssapnlvod8k7mn4/50719412726.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/de8a96dff8cf9926bbbec0bc14b97f3c/89158971517.pdf
    • https://ce-mi.pl/uploads/userfiles/files/vatutigibevarus.pdf
    • http://trungtinjsc.vn/upload/FCK/file/pizusunadaled.pdf
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/zovusozexatiwote.pdf
    • http://terezmisszio.eu/files/file/kawogozipalapuku.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7271b892f1---42981726097.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094400c5f96f---98320226830.pdf
    • http://vietdubai.com/userfiles/file/66547971657.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/e5b85e070862b50e0146ff92c4223298/jiwokidonotajipasulik.pdf
    • http://vanlysecurity.vn/vanly/album/files/guvopikofemuwisi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cis+trans+isomers+worksheet+with+answers
    • 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_off0000c253.bin
9b8505333f45d8873b9b2d886acf80397f9d08d3fcd9bdee57706754664fba8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC253 10536 bytes
font_01_sfnt_off0000da3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3B 16792 bytes
font_02_sfnt_off0000f24d.bin
483915c41760b94e0b2e1cec216d607c031daa22089389ccb681ec8de646746a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 17852 bytes