Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd5971b49689381…

MALICIOUS

PDF

94.3 KB Created: 2021-09-22 12:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 74d96bc7e1222899a455de9fce8f40c2 SHA-1: 86be074e3ca12907613332257b67becd9caff193 SHA-256: 4fd5971b496893818ea4df8224071e367ba356fcfb5b4c359d1d962fa5911304
196 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser update or extension, a common social engineering technique. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.medicellbank.com/userfiles/files/60567683307.pdf In PDF document text
    • http://ropesadventure.com/d/files/zenigif.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/rewobapuga.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/kabetal.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316a1bb06b8---51386581374.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/gifawiroseni.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161446692e6e6c---92840284655.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/98983974814.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/12894492651.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/wulalus.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/41146122309.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/95714776769.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/jaxosozom.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/dabun.pdfIn PDF document text
    • https://udruga-invalida.hr/files/11280023362.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/9123015866.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/28602756956.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/ninosefasesijo.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/bb62ef35019099793b72058df62ed457/tefexesokakonipimatoxog.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/32453623723.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/30306621122.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/81714314844.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/9781875967.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/gavenopunufej.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/50766344717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=friends+season+3+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE21 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_01_sfnt_off0000f410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF410 11000 bytes
SHA-256: 709e057ed3694ef7899341a95eab6e5975de472964e41c4ec0975d249b74906f
font_02_sfnt_off00010d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5D 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729
font_03_sfnt_off00011600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11600 23868 bytes
SHA-256: 3bb2e5f15ed5615d796b501a33aa86029744994ab483b000c76a15c1ec98a736
font_04_sfnt_off0001525a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1525A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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