Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b868453f891d8b9…

MALICIOUS

PDF

85.6 KB Created: 2021-06-30 06:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 991608718b57ce7c3a5c0ba121af9e01 SHA-1: f7be97b9264692e5d35e5e0bd8562db8f9e011d9 SHA-256: 1b868453f891d8b99d66c72aecfb4aba7afe7406e96d1b5c84665c43ced82a42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the link farm structure point towards an attempt to lure users to malicious sites, likely under the guise of providing download links for popular media.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://catamma.ru/uplcv?utm_term=the+croods+full+movie+download+mp4
    • http://www.heksan.com.pl/file/87750974137.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ee0228232---duvuxozovominaba.pdf
    • http://irishvaughans.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/bafowop.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9aad522a6---jureza.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/b2c6aeae34e56fb5607bd465892c01c1/vefebowupekasosuzape.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64298e6d4d---gitexufaxotil.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2fd166e54d3e02fc50b7f9aa9e5692f8/mumubavamixapug.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/49cc38b005d6f26835e04d84e3dfca7c/20516325607.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ade6247b825---55373395866.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfa71eeef7---22661546824.pdf
    • http://4bx.pl/public/file/deweke.pdf
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210603162754.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf292b6252d---dixixuwo.pdf
    • http://choinka4x4.org/cms/files/file/jixifenajozisaweraf.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/5a0113e4fd8ec230f82b8f8507bb0da0/70848130447.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/d2nl3ei8pj87otgif3tfuipm9s/meruwawe.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6d2d3d5acdca8e197ffb99ad61d7d9ae/15364049923.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160adfe4dea791---1542654579.pdf
    • https://securityguardsupply.org/php/uploads/file/4331187256.pdf
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/fomomitukoxojawofawej.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a34dcd5cea4---zelut.pdf
    • http://i-dron.cz/data/file/jomomuzilotuxafumefobi.pdf
    • 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_off0000eb6a.bin
6e58d25b8a2363ca27760a9b98a0ff704e35897a9ef71fc74a2ddf7e68b8e2b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6A 17100 bytes
font_01_sfnt_off000117a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117A5 16792 bytes
font_02_sfnt_off00012fbc.bin
2a923569009a2d6d3841b249a3544286f5b506c1ad18ad02c52a5d0b2502d7f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBC 11080 bytes