Malicious PDF — malware analysis report

Static analysis result for SHA-256 f940c9e2091bb844…

MALICIOUS

PDF

95.2 KB Created: 2021-07-08 05:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7aeaceb723f5daab5ab5aa448ca1893 SHA-1: 49ef4e753d3177167065dcd8eaa991785c908a45 SHA-256: f940c9e2091bb84402216ef8274f230a7807dcf0a2bbb8d58a8c8144b4c39d9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d93b4f3ddc3---buranakuve.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1bdd19916523325f719d4a76da4443e6/buwirif.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/u41gs75vjf53dsg9iuit8s6ve7/semabexo.pdf
    • http://ahcxdq.com/uploads/file/291953584033.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2fc24ee89---wirokopekotibasevusuzede.pdf
    • https://tourgardan.com/basefile/tourgardancom/files/81784183110.pdf
    • http://aaaexpressheating.com/userfiles/file/wowewafokuxefexasemi.pdf
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/42081037498.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0348b5c95---62845029301.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab983c4ad14---41102077671.pdf
    • https://lesartsdansmonjardin.com/userfiles/file/20210611132457.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa45cd0ec7---notetofepef.pdf
    • http://hosungtour.com/FileData/ckfinder/files/20210701_89D3B00B95BC120E.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b24a89d283d---xubik.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/aaaefea273da75edf495201b62d9cd95/37995293774.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607714c7d1c31---vafiwolujofifagub.pdf
    • http://anpo.vn/upload/files/jojaw.pdf
    • http://gorisum.net/fckeditor/upload_file/file/28593072716.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5009bf82c---35820129974.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6df6e6022---28830775136.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6d926ff06---16888873226.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/eqka2u6c9f2ld9ro0tj6q4fnfk/xutubikuta.pdf
    • http://pm-ural.com/uploads/files/46555383398.pdf
    • https://himanshikitchen.info/viking1/uploads/files/batuvibeniwukupovajivap.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/439ba98fca151c435340396a804de5fc/ramatavokojevatapizesoput.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=pokemon+crystal+victory+road
    • 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_off00011189.bin
9ef4dd02cee0ff48d9345d4a1ad79bdf8b28032cdd5cff021c0d16e132582159
pdf-font-stream PDF embedded font (sfnt) at offset 0x11189 17232 bytes
font_01_sfnt_off00013e79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E79 16792 bytes
font_02_sfnt_off00015690.bin
b9a7d452b8c6c994c88428f9225f05409792618978e71bc514d01d63f0352a04
pdf-font-stream PDF embedded font (sfnt) at offset 0x15690 10804 bytes