Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6da8c2cc1ecc42…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 14:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 84045a43c0de3256d2b2325287ff6a5d SHA-1: d2b71a44a9c694da7a6059f2ab0ccd48b8caa9f6 SHA-256: 3e6da8c2cc1ecc429926960e4780a41c69f01030ff36da10fdeab969b1e87902
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable binary data, so the primary indicators are the URLs and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://architettosbaffo.com/userfiles/files/11923227865.pdf In PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/239faec1ffc1d20ba3122fe28fb109c0/74809766199.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/sizaninoradaxuzozokupijur.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608a523b3cd7f---13231776113.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/690b4ade26e254eb6b21913397152305/vezelobovusuburorelotawo.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fb08e5752---kilixigejaduned.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/11442594224.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/28831076160.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/8190a0eaf43840ac7aae3694f0a2ed7c/jesulumojizukivigitumob.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210902132236_91786688.pdfIn PDF document text
    • https://isosklo.cz/uploads/23984205269.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/2po0udmp77g8d6315m4gpg5koi/remowazoxunivoveroz.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/79035689449.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/96523655180.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/67231184845.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e05e5b80def47e08d20f2876c62afd46/tafalepubopegi.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/movexigosefuk.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da6e849293---13602315798.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a50266295---rinagume.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e454769521---kavafupabuvezekefap.pdfIn PDF document text
    • http://df-foundry.net/d/files/ridisudagitinumili.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/gexojidazelutimumejobelu.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/19637573571.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072e1133b788---9007429260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=urbanizacao+em+mocambique+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_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 10924 bytes
SHA-256: 5a2327fc6151a440ead29f40264dc3c6f06f77ba243e351de4fdce75084cb73a
font_01_sfnt_off0000f23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23F 19252 bytes
SHA-256: d4fe14c6a1b49dad83d4df87e677bf92f4c34a42fd118151831527bd720cc4df
font_02_sfnt_off00012496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12496 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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