Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b861198ceb1a7f7…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 05:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6bf65e65c64ca2fe75ee49af19b0a642 SHA-1: daf2fab60816d6628a576a67d082f704a7532323 SHA-256: 4b861198ceb1a7f7d4bfa003ab7664960ef62e72e8ef9ffb976d57d976e3b2e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, including compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination or evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://queure.ru/uplcv?utm_term=attack+on+titan+fan+made+apk PDF link annotation
    • http://plechotice.sk/tmp/file/23177126397.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/4069305640.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/jemixukiwudiri.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/gitijadixuxapa.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/satego.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/zivevobe.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/54329513086.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/vobatuxesemigomajo.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/22703210190.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/84d9f0ce76d189fc74c6f976db4a120f/96667926602.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/kazalixuxozinurozisivefut.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/milapitunapenomobijota.pdfIn PDF document text
    • http://kasargod.net/uploads/file/33314980340.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/49221773516.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/sujidogotu.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/96389548642.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/niberakopabiluwep.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/5956490838.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d02d2bd2dc---86807496955.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/raxaxipuniz.pdfIn PDF document text
    • https://computerzone.pk/file/lupewenixugako.pdfIn PDF document text
    • http://status.cz/UserFiles/File/xutavijafubixakosulotexa.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161409074c45b0---79905698371.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/80317116050.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/kikuwusisiz.pdfIn PDF document text
    • 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_off0000dc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC27 10540 bytes
SHA-256: 90a159f7c1cb44a7e59a9a0f1e3cfe631ce739f999cbe8160718feba90a1d96a
font_01_sfnt_off0000f43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4C 19312 bytes
SHA-256: d544df5b5619b562bc866a3d580b5fa89af25f856ee1ea59d8276b439bbc17e9

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