Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c3a54d1845cdd0…

MALICIOUS

PDF

84.5 KB Created: 2021-09-22 10:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5cf6116b1a17df123682cabc4676c857 SHA-1: f4d8915b4501a07c4f5514e7c8ac8c0eaf8be0f1 SHA-256: b6c3a54d1845cdd0923d2187a24b59f5c37ec9cc808bcc8b27e07c7d8ee56640
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=i+factory+reset+my+phone+and+lost+my+photos
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614469552b25c---jesujejanamomazebip.pdf
    • http://autowagon.it/userfiles/files/ludoxopagunokafidusa.pdf
    • https://lodoshosting.com/calisma2/files/uploads/vidotu.pdf
    • https://knoxvilleremembers.com/media/27851761509.pdf
    • http://hondasushi.com/uploads/files/xowure.pdf
    • https://didacostruzioni.it/userfiles/file/56703153177.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16149c0481b67c---4105529013.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161390eff767a5---17921035402.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f119bcb6dc---58097934459.pdf
    • http://mwbright.com/upload_fck/file/2021-9-21/20210921235748836975.pdf
    • https://dadrarad.ro/userfiles/file/jumaladibivumomavuxoxirez.pdf
    • http://centrlita.ru/archive/image/file/79966334164.pdf
    • http://cichanski.com/Upload/file/45077641570.pdf
    • http://dydlhx.com/upfiles/file///30331651144.pdf
    • http://svb-volleyball.de/userfiles/file/woromixelovagimabulozek.pdf
    • https://betsin.org/userfiles/files/52338208009.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132f5334d320---49938859918.pdf
    • https://almavilag.hu/files/files/pewijimibikinutinaj.pdf
    • http://allier.proximeo.com/ckfinder/userfiles/files/kakuzuwiranezovapiri.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/8dib6aqpvv4oap5jgadegrv3bu/mulupozukisujepexufep.pdf
    • http://diskacme.dk/images/upload/file/zirobukuz.pdf
    • http://motocams.cz/ckfinder/userfiles/files/63322874487.pdf
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21128290303.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_off0000e4f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F8 16792 bytes
font_01_sfnt_off0000fd0f.bin
9a9333486a074e32c4fe86542c3b391550448c6a4908002bce9aa9802c236e5e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0F 10860 bytes
font_02_sfnt_off000115ff.bin
345d3eed276d9e8608e8d34aac8bdcfce985bf30382e752040bde0ce3483b0b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x115FF 18112 bytes