Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebae3c5034453d70…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 18:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 26deb0bfe0e03df5da7df3117f7edf53 SHA-1: 16137679f6cc6622408ba9269ca36195d7bb993d SHA-256: ebae3c5034453d70e39c43a2c68845cbde930b8a04d5624aced7999c5ca44468
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://proleague.dk/userfiles/file/90711297692.pdf In PDF document text
    • https://myparrotfood.com/user_files/files/5109857351.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/nobakalugufobiwifafozog.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/53982082473.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138913326616---rixinufiwakumaxinapi.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/vabofazin.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/mifutuwapuletapikeduge.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/tugexovebagatuvedo.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135f33d89b1d---neposuzagemimexe.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/vujozufokil.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/linopavob.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/bobabugiwixaxapodol.pdfIn PDF document text
    • https://costarica4d.com/contents/files/wadibaz.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161318bb42ecee---zukekiweruvugizojasudol.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613163aadd8cc---vofubujuriratefo.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/jogegezelo.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/nafinomodesavofoteburelo.pdfIn PDF document text
    • http://cortabellanews.com/userimages/58927679747.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161429492ab801---koxupafelubotisirumaniron.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/nawizoxudefa.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/72928607103.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/75066543189.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161316835a0bef---35456750242.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363fd0a2e48---77605608896.pdfIn PDF document text
    • http://chikatere.com/Upload/files/bemud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=extract+apk+from+androidPDF 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_off0000dab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 21348 bytes
SHA-256: 18c42443776cb7df1478451cc173eb41da182e185e6c6d5616a5336126950c0d
font_01_sfnt_off00010f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001279b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279B 10612 bytes
SHA-256: acb9b9fb4d6b7ca59c65d2dde79249ef905a5dde10ece2ad3016e17e9d31728b

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