Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a12b3e9cc7772a…

MALICIOUS

PDF

72.4 KB Created: 2021-09-26 14:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 14bd1e1b16bafe7824c261c6dc833c83 SHA-1: 4db9451665884b6f755e3c7c2d7c08d2eeafeeb4 SHA-256: c3a12b3e9cc7772a63ac182963bdbba323ba5041650eefbea89df66cabcee42f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript is likely used to facilitate the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://3dtechgroup.com/uploads/image/files/lawotisorawigeb.pdf In PDF document text
    • http://makinsushi.com/uploads/files/detujebenunagodalekoba.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/xotinojolomabaj.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/revakiwiwida.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/sabadufufovi.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134aacb31c3f---mefediva.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303f3cde083---bidimowibox.pdfIn PDF document text
    • https://aayams.com/userfiles/file/30887422159.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6177cbc1b---61952979534.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/91c43ff0477234a5b7e916d332859b0f/5944817867.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaf59e2fc3---9992508281.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/duligononamosotenadek.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/61623007697.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/61419703122.pdfIn PDF document text
    • http://proart.by/media/file/85606276437.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/32120582259.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/16479273794.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/donibifafesojozixid.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161340f0ce7602---xatifumosejokuno.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acaed42289---58077249272.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/laxofetipasa.pdfIn PDF document text
    • http://caratow.be/userfiles/file/32219515565.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///64854508370.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/luroliwegosunukigiza.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/jolerijabukeresik.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/sugozuj.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/61108350399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=wombo+ai+no+watermarkPDF 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_off0000b8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B2 16872 bytes
SHA-256: d56d03a4d92ffa11c1f26b543b7de9b34fabb5c0ae123e5ca790ceb082a72e3b
font_01_sfnt_off0000e3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F9 10368 bytes
SHA-256: 561adcee9690f4a79c945a218bfea1f2745d8df2d62225a7d2ce6d822c119f65
font_02_sfnt_off0000fb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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