Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9951296e7515a5d…

MALICIOUS

PDF

83.5 KB Created: 2021-08-31 15:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f9deea7b1ba8f962860bdb29f85b4a1 SHA-1: 0479a6bce18cf9cc7b4d0b11e91187b818bd33df SHA-256: d9951296e7515a5df9f8bbc7c07c73b344085ebadc4a3da3993d274adf481b24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.mueblesgamez.com/ckfinder/userfiles/files/74763254720.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091048e0fafa---77005968535.pdf
    • https://sindonis.com/userfiles/file/pamebazosinisoxonesode.pdf
    • http://woodlander.sk/grafika/file/nosamumilatewurusur.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160733dc76b380---63383834507.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075f7f3b6729---85730660835.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b4ffca497---16175930955.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/aatg0foijgpft61bhrekkvb6vr/72772277997.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607901e61b789---61485094399.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/9325d156a7a41e5cb7c00f2604bf4fa0/92319735896.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2def578823---726126609.pdf
    • http://bangtutrang.com/upload/files/nobedizujidolupogogubop.pdf
    • http://skybuildinfraprojects.com/uploads/lodisugujamipabemox.pdf
    • http://dailymaytrogiang.com/userfiles/files/wagajasaviwijusid.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606decc326e12---83155940291.pdf
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/50789343877.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ec178a7c9---vejotemudofipo.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/6654c389644c232c1559358a872ce596/26349440998.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9c0b62891---27787495445.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161048261873f0---lexivomuxusagugeketasilid.pdf
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/89177596290.pdf
    • http://sapientgenerator.ru/files/userfiles/files/pelojitezomupak.pdf
    • https://calmoinc.com/upload/editor/file/23082766499.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/7cf614173575adfb4b2cd2a4b55e5439/96482802080.pdf
    • http://capital96.com/userfiles/file/63279448944.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=healthy+russian+tea+cakes
    • 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_off0000e01a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE01A 16792 bytes
font_01_sfnt_off0000f82c.bin
d35f1d08d36ee28c76b59b93bd954d871dfc71ac371606f0daa50c780206fa6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF82C 18292 bytes
font_02_sfnt_off000127c5.bin
6d6a34566c487b27ae86ca0445c4bd52bb817b22c80b5767774eee8bdc2a8cfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x127C5 10504 bytes