Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3101ca12243edb…

MALICIOUS

PDF

100.9 KB Created: 2021-07-27 10:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 69339ca9b011ea89dc5f02f71a3de86c SHA-1: d2d44403edd908828c72d470f52dc4135200ab42 SHA-256: 8d3101ca12243edb34544ac4f83fcd800d013914107c462fc3554c4aaf6a692e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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 https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/2q1m5uqvgg4pms0uurbur9apid/36871398330.pdf In PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160adee5c89485---65414568747.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/86286124514.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/mibox.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/rivapekativovozifo.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/48001035956.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a013b4741dd---25190321863.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608724414f8f2---welusududizoniwu.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/b3ee59b420f81c7e4330150b6eb39154/duxajoluj.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/jemovibawijifam.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cba87ed090a---14901420514.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34be8c4e85---66918454154.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/69c3f6a66917993b4491ad81f567f578/tobosupuri.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/6o5r3kvf6dm984h8btbhfkhkqu/sulafukukamimogutoxo.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/96983076285.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ade1578f619---90073470112.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/24608653251.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/kopoveduvikosupetogo.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/39647432041.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5ce645768---dosovufevujezizopajo.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/gasepigitatipesozaluke.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/43002187911.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/46607911049.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/22399332778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+swear+in+roblox+pastebinPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 16288 bytes
SHA-256: 025b2b02b8a77db14cef5000628d897330e8f5bf9a4360f215d4f7163948279d
font_01_sfnt_off0000fc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC68 992 bytes
SHA-256: a11253183555db66a500a34af11dc12b035b479bf422bca0e8f0d11d620cbc92
font_02_sfnt_off000103b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC6 35068 bytes
SHA-256: 5fe03af7c58d8a5f9488a9530b703df4636d32e51b6edfd0201a264504789521
font_04_sfnt_off00016c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C2A 10564 bytes
SHA-256: fd769df247f8f88e73668cc88ddb6d340acab36af700299bc0dc3d76c3a533f2

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