Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca76cd978cfbb2e7…

MALICIOUS

PDF

84.3 KB Created: 2021-08-06 17:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a8dd3419a7db44154dcceeda6ee301f SHA-1: d1f3f9408baedd059283c94c485e2cf41234f8df SHA-256: ca76cd978cfbb2e715dc553758f4f1605b43ec132a32ac78aff8b797969090a2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristics and URLs confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chinoboxingclub.com/clients/36032/File/mivarisumuteju.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0cb6b9b5585797ac9adf40dd181b24bf/xefukabesowodawutobizudif.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/r0lflc0ir02rm5h6utlk651lbe/fijajuxunamuwi.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/73a5ffa290559fc7dd6d7c332024ffbc/fonumavodugi.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17a41b32b---mikekafujezarojixovil.pdf
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75982555481.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe50153ae4---xudabisogaxezoxiwiz.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3ef0b20a8054db6d1704caa4ccae5621/sufumokonod.pdf
    • http://ngor2-3.com/file_media/file_image/file/47951853054.pdf
    • http://delshadian.com/public/userfiles/file/78240980265.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e683322f378---vabow.pdf
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/zebewejar.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f314e1bc8---nimasew.pdf
    • https://tortugafilms.ca/adminfiles/file/70905750478.pdf
    • http://akicgiyim.com/userfiles/file/pezerakiniratinijaj.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/38689b008ad4e3b39187776d8dfc8d04/36465041463.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ssshhh+phir+koi+hai+vikraal+aur+gabraal+full+episodes
    • 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_off0000e5b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B5 16792 bytes
font_01_sfnt_off0000fdcc.bin
ede69afb3655721207cd6d6902c45d600900b5d3444dd7d2121cb01242d58a56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 11048 bytes
font_02_sfnt_off00011737.bin
e4e86037a3e07ca7156cfd3b6b2bebec32c2f47c5dbed010e0176d974144a3c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11737 16932 bytes

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