Malicious PDF — malware analysis report

Static analysis result for SHA-256 475d7d240f126f83…

MALICIOUS

PDF

73.0 KB Created: 2021-09-20 14:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5e1c97bd957419df1e08d306af4ce381 SHA-1: aa4a0b3d65c13e5ede069674f0be4070f6ac7049 SHA-256: 475d7d240f126f83f8f657f26687ef910b7b0059146dc12703d099a4d273e583
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm intended to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://jinanxintiandi.com/userfiles/files/jolebojijexo.pdf In PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b65e6b315a---bigezakofesewopunakomufa.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/tanebixugejijediruwukedaf.pdfIn PDF document text
    • http://santehnika34.ru/images/file/baxaxibazijes.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/lotaxixozeza.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/mivikeroj.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/31276415549.pdfIn PDF document text
    • http://emannsltd.com/userfiles/vabotatawokunufezusix.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/xosid.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/14638592759.pdfIn PDF document text
    • http://skomi.ru/img/files/file/63483931731.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9abc56eaa215ab42dba1cb41fc3e3f48/wafolusotomovowasor.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/nibasutukorozun.pdfIn PDF document text
    • http://semanbio.com/upload/files/3218561201.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/sumitunelavawaj.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/fubekig.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bda92d731---30115019625.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/gizelijudavoxaw.pdfIn PDF document text
    • http://lrpharmaceutical.com/upload/files/noselapumivexo.pdfIn PDF document text
    • http://preiss.at/upload_files/files/fosuzajurufufujiremuga.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613715b0a3940---mewumibufatugerawe.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/41124917115.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/kubogavugubibizilegetedak.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/56646862914.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16131b4bcdcad6---jelosugutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=lowest+smartphone+price+in+bangladeshPDF 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_off0000baa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BF 11144 bytes
SHA-256: cfc9d7b6b379ff1caa50ec6cf562009e7aa2bf1874b66c639c6943bac1a524a4
font_02_sfnt_off0000ec32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC32 16412 bytes
SHA-256: 02bbf13d88a64e10c878e0cfba8db49e6ec4c0429fe1d38ea9f34f38ab86e2dd