Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2bd5441d566c43…

MALICIOUS

PDF

83.2 KB Created: 2021-09-08 11:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 352cc36deaa6452fdb5f62e7335c5f2f SHA-1: d04038d276adf8b5c421db2df3b9f0ff8dda2a03 SHA-256: 4d2bd5441d566c43a3ce50e0a70016244bf103237dea55d74553bd933af696d0
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The document employs a social-engineering lure to prompt the user to install a browser extension or update, a common method for distributing malware or stealing credentials. While no scripts were directly extracted, the PDF structure and embedded links suggest it is designed to redirect users to compromised sites or download malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cn-polylysine.com/d/files/nebewedagoxugaxobe.pdf In PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/caa97ff316b3e3a7befb3182b390cfe7/33114345326.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/61965052864.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e63580e72---65073695930.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b19eecf1a2---tobojijofivunegakirexel.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/36992041080.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4fd145799---fenepetarinapixupitoniv.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/62662954304.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jijeruriwifawewikazuvuwib.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba70440134---janekubereworifonaxuvati.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/nekeno.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/111850328236.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/bevixixabosuvawuwigeg.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609102706e98a---mosibojogax.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/bagetemovak.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fed03dbfc9---xakagobarabitojepakusa.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/7113091095.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a79f6e2c5---34175286357.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/820c5bd37b475b93386784c256eef5f4/wiluguvisidova.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/pebopadojebeb.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/turoxefazusezidodal.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad408749198---lejepasobitelijimomi.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/8e8621eb4165a769b2a7fa0869924a74/bepetuteluvur.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/64516795287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+remove+add+ons+from+firefox+manuallyPDF 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_off0000de7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7E 17724 bytes
SHA-256: 47851df7b65f843d4ce17687c2e65928dff4793a33e2a997cc34ef2dfdc9c613
font_01_sfnt_off00010d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001259e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259E 10976 bytes
SHA-256: a96d8d20c0614880378e62adede8b48c75eb7caff12564dee1844cf0c52a157f

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