Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73a9bc11e453b48…

MALICIOUS

PDF

80.0 KB Created: 2021-09-22 21:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 63639a71f16936271f95b7de737ae54c SHA-1: 5e1bf8be050f1f6fe6c4cd903fb70c476e2476f7 SHA-256: c73a9bc11e453b488929ee6cb058909961645445cc53a2f4752269f9d5b3ee93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=how+to+draw+a+room PDF link annotation
    • http://namjapizza.com/app/webroot/files/wewudaxigitakomigupog.pdfIn PDF document text
    • http://secoinblock.com/upload/files/lezobepuvikok.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/varuj.pdfIn PDF document text
    • http://boldogelet.hu/media/45121548104.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/misewigemupejifaduvaxam.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/80525824848.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/nurivivemetexalemizunuj.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/82607967875.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99660353491.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/73555355387.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/90107973957.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/92022592179.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/39019291681.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210901_010337.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/moson.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/lelobibotazikowamamadaxo.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/e87086604b8ac970416f049a2b13aa6e/wufuwekixujubuvutisukaf.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/25197777395.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131816cb9eeb---64110259996.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/67171133022.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd0c9991d2---74377342506.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/69655562446.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec4a4ebce2---95058810004.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/lawovosutojusagetopuxa.pdfIn PDF document text
    • 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_off0000d56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56D 9944 bytes
SHA-256: 4d844c71428adbec8ad9c40715a728166249b5da1a86099f37c47069ce8dd821
font_01_sfnt_off0000eb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB67 18052 bytes
SHA-256: 44acd299d5a22c7d6cf6d66b4fe2047df0cbe2477d211dd4c9791be78636e16c
font_02_sfnt_off00011a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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