Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67456be2912ee5c…

MALICIOUS

PDF

72.8 KB Created: 2021-09-03 13:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e3b6f52947b52a4c1a1abedbdb789be6 SHA-1: 5cbde7038b3c645b5e072d87f61113da6e7e2d61 SHA-256: b67456be2912ee5c0f57771fd25449b3f184c71dd7530a4058140bffb4f8fd3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to various websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cmtoolsrental.com/user_img/files/fazimawixotutajuzegaja.pdf In PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/14383563932.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/28160368400.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/fccda397116168f1eb6030ffa9021601/woribad.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/11693037664.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/suzenopov.pdfIn PDF document text
    • http://blackshirts1961.com/clients/7/71/7137ee3fbd99c17d296746b31d66a47b/File/95316385087.pdfIn PDF document text
    • http://ux-school.ru/files/files/70163893786.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cf6e2e6a6---petopuvowutavoramexov.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096782e3862f---gewadikiguxag.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/fi1143bagl9ov1d41ha12un108/27149134075.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082c1b6c4bf0---wexonujigo.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/22962630581.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/zonavewuvepepurerozixamen.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/faruvegore.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/kerugonebivanuw.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/faramofesomawiwebubunolew.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/d6984e93c9c1a5aa9755775a5fa7ba09/67665682960.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/94113266187.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/04efd0c8cebc0bbbd0b9d605d300fa7c/97683329400.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/41666651841.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/kefirurefeso.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/wisakugumubalujaj.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/47474529604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=manual+inversor+de+frequencia+schneider+atv312PDF link annotation
    • 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_off0000b8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A7 11224 bytes
SHA-256: c4ad1edf78e74d10bf538e5de48dfdea14a01acdb98cacd9787a345600102b58
font_01_sfnt_off0000d2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CF 16460 bytes
SHA-256: 61a26f6bd2dea4efa62e4a825b413e88f4b739322bf64e389630333b4b6a3cc6
font_02_sfnt_off0000fcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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