Malicious PDF — malware analysis report

Static analysis result for SHA-256 6202ebce82f46f41…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 08:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0b9737a0273f45783323d508c18cb5f7 SHA-1: 631e5dfc892d7d2451e2e7fc4b824bd23f7279bb SHA-256: 6202ebce82f46f41c0e9519eae8a68954f2cf8a8488e9612ff08c5e0d81c4ee5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various external PDF files, some of which are hosted on compromised CMS upload directories. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/zones.pdf In PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/71710408914.pdfIn PDF document text
    • http://nanopena.cz/upload/file/roxisaw.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/jotudasakawujulesobed.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/nuvajilokase.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210910005223468.pdfIn PDF document text
    • https://empresa-venta.hr/files/33447116346.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/56258157761.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210903_5C85EB57EBB2B1EC.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/zowomunuwenixovodumuwezi.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/37517542932.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/vabib.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613333da65ab4---zonog.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/72905612936.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/wexopiladu.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/45609428070.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614301938f4fa---22860041828.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109050928464600.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/37455831331.pdfIn PDF document text
    • http://alkanboya.com/files/file///35583041056.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/dolakubedurekaxorubo.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/32555721044.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/loregonirimap.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e515ac7dde---jaxofonelasapuwafamuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=harry+potter+on+which+streaming+servicePDF 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_off0000d5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D6 11032 bytes
SHA-256: 00bc71f73654912407eb2c3d0ab613edd6bc63f168e2de0a236862852d11bf03
font_01_sfnt_off0000ef60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF60 18032 bytes
SHA-256: a9f6dfa11f3e3b9159936557250e279f576c00bfb8ec623fe62a35404042ffb0
font_02_sfnt_off00011eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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