Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca9a3f5a5a59cf4…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 00:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5719859ecf92b26233b5083c0abf656c SHA-1: 7a6d12433eb55a36a0a04edc824880f6740c43f5 SHA-256: 0ca9a3f5a5a59cf40e06538dd8caa1e0f10502a7d4f967ed6ec91cac642e7900
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The presence of link farms on disposable hosting further indicates a malicious intent to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a421b5e7fd---85227462170.pdf
    • http://fxmeat.com/upload/file/aa728791c6c1e42e28d498247ddc2f64.pdf
    • https://sona3elkhair.com/userfiles/file/8462837162.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b11bf3cfaffb266a167c52147ed8db1a/lefagotubux.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/543255552a728d911d4307c87f23d9f1/rukinezelewogobokavagozo.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/i00ncsia21prfcskntefs7u77q/68495335791.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608684301974a---39872387396.pdf
    • http://www.como-grup.ro/fisiere/file/50608237826.pdf
    • http://studio-castiglioni.com/userfiles/files/86680497821.pdf
    • http://farmaciafasolis.eu/userfiles/files/62426780928.pdf
    • http://lawngo.net/fckfiles/xotapewuwizid.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091af72b5a4a---92209755893.pdf
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/8159175043.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608e713301a76---44656294005.pdf
    • http://grafichesirio.com/userfiles/files/gakojotanivove.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160e49a9f2c335---bevaniwiwoduvakok.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/sjua7qvauqsb54of6ab40i8iq1/juzijidawowe.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16123bce8aaca7---67646759334.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/a8fc8c6a5f6613a0eeb500dd17f3fa2a/42186317900.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16072b17c57c6e---duwereva.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/86a9c59680cc712a44b09af4efcdbf49/kiwudu.pdf
    • http://awkontrakt.pl/ckfinder/userfiles/files/taxater.pdf
    • http://techsystem.gr/data/uploads/ckeditor/files/gokujuvupowopipiku.pdf
    • http://inventory-acepipe.com/images/uploads/files/33384346537.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c833a137d---laribarorevakozaburulus.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=genetica+pdf+gratis
    • 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_off0000dd02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD02 16792 bytes
font_01_sfnt_off0000f514.bin
7e82d6e9831a876eeeddc21632e9feef8e96c47d71fc49935bed710b0a0147bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF514 17272 bytes
font_02_sfnt_off0001218f.bin
45419aa76facaa4dae22cca12ee3d275dc513fbeee1f8bcca6b38f37b330cda9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1218F 10668 bytes