Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0e1085df877b6a…

MALICIOUS

PDF

85.0 KB Created: 2021-09-09 08:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c839d2a4da349a150526d79e3160454 SHA-1: ce24d88add3fac5f54c45284ad121baed3960afa SHA-256: 9d0e1085df877b6a69bba4c5c4b1ce55f0cb5722c36433068b6b2ca47d147660
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link farm designed to lure users into downloading further malicious content, likely disguised as updates or viewers. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly indicates a social engineering attempt to trick the user into installing unwanted software. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://studiofranzoni.eu/userfiles/files/gevadiwe.pdf In PDF document text
    • https://duongthuy.net/userfiles/file/narinajaweno.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137e03b21b5f---salasez.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613024e8ec7c2---5899691658.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/64743309254.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/96486117574.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/31291971147.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137534a24103---43125270323.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/17604979269.pdfIn PDF document text
    • https://777mto.info/contents/files/59827762819.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/38597229103.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/45598321506.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/29077910719.pdfIn PDF document text
    • https://redac.ch/upload/dunerutode.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/kizobadefut.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/20692286333.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/22518152034.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/panatan.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161364e6a910f8---tokizunisibekes.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/naxurofovuwe.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/98097212739.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/tideminedeta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=chrome+apk+free+download+for+pcPDF link annotation
    • https://lapdonline.org/file/96402911823.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_off0000e73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73B 10736 bytes
SHA-256: 520363a8fa0ee90e5f9ce5cab8d89beaf803d8fc741122db4ae323c61aceb386
font_01_sfnt_off0000ffc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC8 18072 bytes
SHA-256: 680cde86c0cf314f47f08829cc22e76622d504ca0417bce7ff87c79b83a7dbbe
font_02_sfnt_off00012e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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