Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f438004e319b2b…

MALICIOUS

PDF

397.4 KB Created: 2021-07-19 08:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 68ef11a7882bf3fc0d32f32319900b80 SHA-1: 3748ca365f63b6aabfb5356b9e158cf0dcf597a6 SHA-256: 99f438004e319b2b78bf1eebf352d45010e551507977a26da80e16ed5b1eb71f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_INVOICE_LURE' heuristic suggests the document is designed to deceive users with a fake invoice. Numerous embedded URLs point to compromised WordPress sites and other domains, likely serving as download locations for further malicious payloads. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8092

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://100gastro.cz/soubory/files/sonalolezezegegolokonuj.pdf In PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/25736948882.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72cdb55904---85912513414.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/1b8036d6916d0e579ebedc8cc8e00d87/sifiwajogimani.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/18712343972.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/zanilokinonomiwutopojize.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/48820231957.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096cc2b91bfd---3291990726.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/68460491654.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/56956259174.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/13l2i3jc3hsp9usqlca82up8si/reriba.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/ff9ab2b9b5b819b5dd0f048927fc5851/rimemitatelozapupudexuno.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/23567477838.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/titobisefupirodarate.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/doteb.pdfIn PDF document text
    • http://heizler.hu/files/file/97087621613.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3ce548217---xetulilixo.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/26cd10bdb41a4c06c6fab7802edfd2c0/2809932551.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160708dfb1c6bb---karuvadeki.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/29918721572.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/roveduxexafuz.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e79a9e8f9ff---faneg.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/jabukedix.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/30268537771.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160be000bbd2fa---68413716222.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/7d5916fba60e3bf7775267eb7af946fb/mikidegidameraniga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=railway+traction+substationPDF 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_off0005c1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C1DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0005d9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D9F4 10576 bytes
SHA-256: 88f48d64638c3349366ddf3962cc1058bef92d77b6c7d977496321fcd5377dcd
font_02_sfnt_off0005f24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F24F 19664 bytes
SHA-256: 8a1913587c5d03ffacdb5615d81be135b5b9d71c43d65f8613b4d7c74131b46a

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