Malicious PDF — malware analysis report

Static analysis result for SHA-256 f94f42391fe12dae…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 18:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7770ffabf9181924cfa048c4ddf6991 SHA-1: f2d989468aa876e7853db8c74efed477cf556aac SHA-256: f94f42391fe12daefc6111a17cfd8ffb3abc2c2665301cf8bc470a48fd853fce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The PDF structure itself is indicative of a link farm, a common tactic for SEO poisoning or distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/31723d35e07de73bd0f9bd81a40d323c/toludubenuxubokosunaw.pdf
    • https://familienbilstrup.dk/ckfinder/userfiles/files/xavatiw.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8cffaa17e---37318307692.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/lgmnlki981q86gle33e6g4mode/tepowenuti.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/60886cddd885d546df1c581a7e226f77/19032184252.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/o1t4ld2rf9s719i5l92hd5f1jf/tures.pdf
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vetiwotesuxura.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717b43dcd7e---kubajirivare.pdf
    • http://tuecpa.com/file_media/file_image/file/lagetugesa.pdf
    • https://kaktutzhit.by/uploads/files/savuvuxuperobufuxonapa.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b27c04a4f---65925955835.pdf
    • https://equinox-e.com/upload/files/wifajuzoli.pdf
    • http://tuzvedo.hu/elemek/file/50707899813.pdf
    • http://stphilomenaonline.org/userfiles/file/rozowe.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160857379e502e---salakakumulo.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612b12b4db0cf---reverabafawumipabifedeta.pdf
    • http://qianlong99.org/ckfinder/userfiles/files/rimalorobudid.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/0f4ccd80137aa4a879e049948577ae08/72243321494.pdf
    • http://beastyenergy.com/userfiles/file/fokegatiz.pdf
    • https://scavilecis.it/userfiles/file/51633542049.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/5bd6d88870b5616e81d21a30104886cd/36104881145.pdf
    • http://ottuk-e.org/userData/board/file/gogaguroxomowowegesusu.pdf
    • http://guides2alpes.org/uploads/file/18087083181.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ec337c95f---4221870846.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=white+like+her+pdf
    • https://lapdonline.org/file/muzowozivuroniranef.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_off0000d968.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD968 16792 bytes
font_01_sfnt_off0000f17a.bin
eb55daac3422522dfb038607d11f815476d4e897efeae46d240bc6a8f834b9ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 18500 bytes
font_02_sfnt_off000120e4.bin
d123d83ae04104085398301ec7a027674088f2e1122fdd0306450be5fc1ab9ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x120E4 10124 bytes