Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac88c0cbfff3ca9…

MALICIOUS

PDF

71.8 KB Created: 2021-09-27 01:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fad2e96ad0931a566cbdd398253ea426 SHA-1: c41d806726fee8c81c625f58e4dcfe2d8af10369 SHA-256: dac88c0cbfff3ca9f04bd8f992dee63b852b63842daa7d4b9a521630d82cd27e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The structure indicates a link farm intended to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145284ee1695---damani.pdf In PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16149f0ffa088f---36514587720.pdfIn PDF document text
    • http://parateam.cz/file/worozakogosusudude.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/47167817305.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161316da4bab36---gogagovenisogidikivekabax.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/nutujupim.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/gebabulojukepukalido.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614be076c22b1---72989813671.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/nabod.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/dubanodedojow.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/luxoduzulomewis.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614394028a489---setojul.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/2267791877.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/ripizerogoxub.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/t2u9i8egeeegi2hq8j7hq787vb/94225751163.pdfIn PDF document text
    • http://limoride.net/gallery/file/rusox.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/dijivamu.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/pafoxokekabegixutun.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/66577783009.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/50403729986.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e43084993e---watinim.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/64709175534.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613803c82c8e4---bukokugafifogisonefix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=jazz+piano+from+scratch+pdfPDF 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_off0000b449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB449 17608 bytes
SHA-256: 2159a3bf9d5eaa24a418c469a1a4f8b3dcc3c11bc437ad7e587a85392b6048c8
font_01_sfnt_off0000e12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF941 10756 bytes
SHA-256: 076917b0d970e07a3945197ca54fa14062c2667712c97584ac13cefa4fea91b4

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