Malicious PDF — malware analysis report

Static analysis result for SHA-256 4129dbce4ea9b0d6…

MALICIOUS

PDF

89.6 KB Created: 2021-06-27 01:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11012b46a88d6b25a0842370d5436734 SHA-1: ee88ca9881e08d1eed335fbb2fac31f020960286 SHA-256: 4129dbce4ea9b0d6413ab0ab8e2374cb677a2a7a95fdf03c7381ef88851805d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d24bc0666---81247798341.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075a77e72263---nelisunemarupeligup.pdf
    • http://sarljarry.fr/userfiles/file/kujovunulewojajiwevite.pdf
    • https://art-lamps-rali.eu/files/file/46063194333.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/1b9fd0e9492ec5ad9b08f1b6995c4fcf/46376654293.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2248a9263---47211172309.pdf
    • http://transcash.com/ci/userfiles/files/pisiseb.pdf
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/70126332955.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d18974523e---67909984844.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec2f9d706e---kegovuxujojoginidebo.pdf
    • http://nesthomes.in/userfiles/file/vevip.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbc552c76a---2164469726.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/k36pln0j1l8q1k0ouabh4vmgn2/burisugufagogogol.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b783de324bb---morarubigunekipozobese.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5fe23dood0pis87028tkaou4r6/49543214272.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a0ad2fc5---fupitakuzeketuragajakux.pdf
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/xidizuxaripimuruwalem.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/64b60b77ce3b47bb7d481619c8bebf20/buvome.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/88a34412a34f0c2c644798f2d0623caf/60665250676.pdf
    • http://alexlunacoach.com/img/editor/file/tufixepedumosuxejimenina.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/nker0k9p0rnacbhvflhcc3ma2f/14278563550.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/86679560025.pdf
    • https://tidurmalam.com/contents//files/lewedusiredi.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bccfe913097---79396270422.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=never+dying+jellyfish
    • 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_off0000fcb5.bin
c8c7fc692845cfc0dad59446d289a96d66bb709b4e857965765c8625b963e852
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB5 10540 bytes
font_01_sfnt_off0001145a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1145A 16792 bytes
font_02_sfnt_off00012c6c.bin
d31879db84626676d9603ad2e8fc66737045f0ae548b2bf01567ed505aae4e92
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6C 17476 bytes