Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b3cacb0eba9759…

MALICIOUS

PDF

79.4 KB Created: 2021-09-16 13:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fb7c67bce5bbcf3d24d7a4980a885094 SHA-1: 76d8bf6b94d2c1c6c9c45fd1f9b3676a9212439a SHA-256: b6b3cacb0eba975923c781ad5abdec142cf597671b367efa33a49fd835e45eea
172 Risk Score

Malware Insights

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

This PDF sample was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and presents a link farm hosted on compromised WordPress sites, likely intended to trick users into downloading further malicious content. The presence of a visual download button further supports a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chanakyaaerospacedefence.com/userfiles/file/10102538327.pdf In PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375f19f0c7b---54164057676.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/62722721219.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/2456924612.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/28141376765.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/89091122107.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/kirowaxovividifuxu.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161316c920bdf4---nikofisibavoxuredazorej.pdfIn PDF document text
    • http://samtle.net/ckupload/files/65205643998.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/25055935417.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/7212865150.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/jivekuzew.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/garud.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/rudopizawawilarubom.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/12294368187.pdfIn PDF document text
    • http://ranch.pl/files/file/96442249811.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/sakijidu.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/87317eaf2e526873eb7c85dea8558e7e/jejinudigobegekuxup.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/givuxuvol.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613433b35dcd8---rodiwaxebazegide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=fight+club+watch+with+english+subtitlesPDF 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_off0000c888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC888 21496 bytes
SHA-256: 809921e20e04b48d015d159f13c5688a8cf1be8ae36d0ebf70a8a81213fdbc50
font_01_sfnt_off0001002d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002D 10592 bytes
SHA-256: 0354724d48676e710912aeda8df6e9371fd6d543b95492a1f830013a02f0826c
font_02_sfnt_off00011860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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