Malicious PDF — malware analysis report

Static analysis result for SHA-256 497a1f7cc9a942db…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 11:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3e7141c29280e4f5be0d9f390759f23d SHA-1: c56864a0dc7132d2ba6944c226d9595cdee91040 SHA-256: 497a1f7cc9a942dbcd4cebf53d8a6cfd60ac2afe7b6f724ba8be63e075255e72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ms02bet.net/contents/files/kewotexije.pdf In PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/srjf7fc0rfnqgtvp0sg3k0bgq2/21190333014.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/lamowedipupabaxurogidani.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/wubat.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/fexego.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/91398215903.pdfIn PDF document text
    • https://lazerom.pro/media/file/98164264473.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/34324004384.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/limetutil.pdfIn PDF document text
    • http://citra.cl/userfiles/file/76397496107.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613987a600690---duwekalame.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/72723526966.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/dovetobe.pdfIn PDF document text
    • http://ingatlanfelugyelet.hu/uploads/file/lawuxadipo.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/getugetiguxut.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210912082031.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/nobexabifujuwekosikulabot.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/kebojekefos.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/c44d9cd39240a207d9bc98f0374abbb6/63285565776.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/bapaju.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/265087592.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/79143125247.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3aed5079d---73268008634.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/jisude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=anatomias+intimas+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_off0000d21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 10360 bytes
SHA-256: cd1fa35bb7abe8b440b4c77d2497e7082df6ad37e6536bcef5d31d1eca167548
font_02_sfnt_off0001019a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019A 18296 bytes
SHA-256: 44f4fb73d9b21d9cecdbb3b89e77fcb814ffc7fcd2fd2997f22a79cf67941252

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