Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54cf39b45bc6226…

MALICIOUS

PDF

71.6 KB Created: 2021-09-16 14:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8a458299009bf32db6d1a38b1e69cb42 SHA-1: 1a927605738dd44770e657c3c39c607842a34da8 SHA-256: b54cf39b45bc6226da3eeac22b031d41c1a7b69e327e5f1d70b52716debe7268
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dda2e4050---3245754713.pdf In PDF document text
    • http://citysoupsbellevue.com/uploads/files/kisaxanolexonezewisok.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/xizezatiwigebotoxam.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/20dc4cb67441f3c36df61f86ddecd6b2/16581924724.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/vezitozopitisorel.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/40891359961371a70c813b.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/lulap.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/xolibora.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/5ebb2bceda2640cf8779df61d0d42762/morerefapemosisox.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/62798394343.pdfIn PDF document text
    • http://cecev.com/stockages/files/pekobedidegogumevarobagil.pdfIn PDF document text
    • http://panova-art.com/files/file/21008449918.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/1028635630.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/jezej.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/rujosemogosugarira.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/sulujisajisovebitiwanaro.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161386b3d5d53c---57517622725.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/23111887650.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/92406185238.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/wufolosefubu.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0i6cfkq7hu15135b8qbl579vr1/28982787142.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/tezajokezaxoregutunerinil.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d30f3d0c7f---pekujejaj.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/e952fe56266da27ca3ad92e307a2c6b0/raxojejobukivuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=kitty+live+appPDF 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_off0000b906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11C 9924 bytes
SHA-256: 4025507993a20945c856a955af0c428add530c1d3fbaef8f0041d56a18afa61e
font_02_sfnt_off0000e727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE727 16264 bytes
SHA-256: 7a9358d1242ad6dcb71a64baddebe4dc7511a87931e8272c5973acbfc7711049

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