Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c103ee39bb99d67…

MALICIOUS

PDF

84.5 KB Created: 2021-08-21 21:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e2130af0f599034d42361a838a9875a2 SHA-1: e0706658b111822d5dae1949deca039fb5634c19 SHA-256: 9c103ee39bb99d675eaca9d6b9a387f6892492ff9bc545954ce28e9faa633d78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely serving as a distribution point for phishing or malware. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://allytemp.ru/uplcv?utm_term=war+full+movie+free+download+movies+counter PDF link annotation
    • http://abwessex.com/uploads/files/17230180607.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607fde7c00897---25228759500.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/63e3eb4e86a1352c5d05e35cc2805754/lidelipikoxemerov.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/49950cc57b4fba21a4621b1904d33f8e/jujurisexenuzof.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/vegalufavosotup.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607808f23a1b1---31203438227.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/37584896158.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/69793745814.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4ba49e91a---76218434335.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/chshugnaiiav926oc11a46kmog/xutageroxogu.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092395c54ff2---73766652419.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/93808860913.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/2474c01194ca17a6a99cc919d3921797/3877984265.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608deb8eb8843---79676774550.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607666da386f1---vegidilelaxafisosifipi.pdfIn PDF document text
    • http://schokozentrale.de/idata/88601419716.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/xawiseduzitiwixi.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202108060456299497.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/96092544405.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/73576877954.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/xawilopiwigi.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/wejawexebewazikiv.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/97365385062.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/xolegirebotape.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/baf32fc982ff21ae39f612ea2c2304ce/21344998225.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/290a77142b01b75de0195d47efc6e5a5/83377815416.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 16956 bytes
SHA-256: 95def82eea1b9086a8d8c99ac95c6502450e7190cd9d93d19870be811a7ad6d2
font_01_sfnt_off000111ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EC 10880 bytes
SHA-256: 95cd3c41f20cd90679bc56f78cfc833d0c77cc3f7e39d645f3ce78a714b8f7ad
font_02_sfnt_off00012b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1