Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f72a6b322637d42…

MALICIOUS

PDF

72.8 KB Created: 2021-09-28 04:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 39d00d7f72a6d3146f17c2a307d19565 SHA-1: e0170c51d12237228fcf3890f365adf8c0676b64 SHA-256: 5f72a6b322637d4267c479356362d7533261a045d449470ab6cc6acff6fde507
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crewmak.ru/uplcv?utm_term=9+android+settings+you+need+to+turn+off+now PDF link annotation
    • http://offerseir.com/basefile/offerseircom/files/nolisovefetipowiv.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/18941145314.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161378fc5ad3ff---81703228457.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/lanaj.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/pekatamizazebeborim.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/73445438733.pdfIn PDF document text
    • https://xenonsvjetla.com/files/83436608829.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/01c34ebc827243aa72d63831845528a1/pegaxebemokubuvus.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c96956ec0---kolajimomelugisenimojusa.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/4jo7gsfv7omretjkg6v8di49tu/sezukijofa.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/vebeduxeroxizawow.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/nakokabewaguwarafib.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/30539054336.pdfIn PDF document text
    • https://afayl.com/userfiles/file/nisoludofinilijataridisoj.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/todunodaxik.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e24c66984321ab7866cefae2a84d1754/joritafumojikulimikix.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/jegabime.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/bujujapikuzazafogozulad.pdfIn PDF document text
    • http://keacg.com/upload/files/20270645502.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/lububapujunepe.pdfIn PDF document text
    • https://www.suep.gr/ckfinder/userfiles/files/89021935587.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/rixizukuduwaxazizovojodi.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/87674506106.pdfIn PDF document text
    • https://thermaltrailrace.com/imagini_ws/lelowipawerinimezugobuni.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1632057303_a239c3937e.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_off0000b791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA3 17172 bytes
SHA-256: c2e1c45705920ada4aeb1c7c39c7e5c4f258b5b5fac241aa7381e7e26a42e284
font_02_sfnt_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 10852 bytes
SHA-256: 9730304c339f2cfdb3caaf0fdf37db2174fa71356d60ff63d53fd1119ee17933

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