Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d294e9dd7fe5132…

MALICIOUS

PDF

86.7 KB Created: 2021-09-05 23:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3442e2a46f0002a232b8991a108702be SHA-1: 521b9589af998b626f989f56c7de2ca5a2d37226 SHA-256: 4d294e9dd7fe51328d6a7ed52bdfa1409cd4e240ffaeb2e2cf9e0f3aa2e1208c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=networking+book+free+pdf
    • https://matrainagycsalados.hu/userfiles/file/13173162991.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607597596c9cc---11902162724.pdf
    • http://myphamlulanjina.com/upload/files/35623941189.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074bb3b29abd---magakunoxuxeku.pdf
    • http://nowator-zpu.pl/userfiles/file/xidofu.pdf
    • https://activepymes.com/pub/file/36046631134.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/n7ic02e0b0101ed8di75g2ufvu/galavazixix.pdf
    • http://goldenrulelodge24.com/clients/860883/File/kameradotiwadan.pdf
    • http://muzeumostrowiec.pl/obrazy/file/65147286593.pdf
    • https://louvre.lv/res/wysiwyg/file/gepamarazedixuj.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/hlncimerrbo6sa1qmhcaf2n3g2/34197893492.pdf
    • https://publicbridge.pl/userfiles/file/76589813852.pdf
    • http://marketingnews.fr/images/file/vetowudusilubetasoxowiv.pdf
    • http://honderhotel.com/UploadFiles/FCKeditor/20210728071046.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d30ec85561---67409687778.pdf
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/mowoxin.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/50d097ff13b6c9e80077a6393ad5c605/zisalax.pdf
    • https://ikitellirezistans.com/upload/files/gobewutefenufim.pdf
    • http://polimak.pl/userfiles/file/piwitixanukirowasidolej.pdf
    • http://chinalabware.ru/d/files/fojitoxewusededele.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1611b4f3b43af1---77428496147.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c65505ea3c7---davoxuvuwekafapubofomi.pdf
    • https://songhongresort.com/img/files/ketorowuvaf.pdf
    • https://indiansabroad.uk/userfiles/file/77092899986.pdf
    • http://studioarchterreni.it/userfiles/files/moparorosesilodesuguj.pdf
    • 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_off0000ea1a.bin
a59c14fd22d89ac6d8f3d61fa00695c24cac7f1afeb971157c7e4012c8b5396f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1A 19316 bytes
font_01_sfnt_off00011d0a.bin
0fb4e6aa2a0f7c582ea2b1a59c5722706bc613aee2dedccb7cf2d660ef1cde2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0A 10592 bytes
font_02_sfnt_off000134f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134F9 16792 bytes