Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d4e0f51768531a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 00:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3018ec9b25b35a08cca5e9009d447bcc SHA-1: 240a4292f1b15492f935372e4b4952fec48702f3 SHA-256: b5d4e0f51768531a9e618286a368ab83fbe97f180687d532831ebf89717feae5
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious. It employs a social engineering lure, instructing the user to install a browser plugin or update, a common tactic for credential harvesting or malware delivery. The document contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting it functions as a dropper or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://nomylo.ru/uplcv?utm_term=this+plugin+is+not+supported+google+chrome+android PDF link annotation
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613020b2a099e---82818868053.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614506aed81c4---38969622202.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/rifamimuve.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/dipawobituzolu.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/pizevunebu.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/83282064182.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/pizisapopibelifi.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/98002655187.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210916_032489A98F225A23.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/e7026def5a1c6bbe69714cb1515a4140/80734007822.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/74488556349.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/rekegabibibomigo.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/mudufori.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/monogusumikuwe.pdfIn PDF document text
    • http://skncn.com/u/files/14466999968.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/pinagurilo.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/367298686.pdfIn PDF document text
    • http://mlight.cz/archiv/file/powidutokuz.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d28d64eb8---92907069916.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/xugabipi.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/dabufurofad.pdfIn PDF document text
    • http://kasand.com/userfiles/relebaworuworusis.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/panidajovar.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/mekonodowep.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_off0000dc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC07 17784 bytes
SHA-256: dfcac58c2d605e845dcfe9c2103f438e296f1e5fe0605888745e50c7d38b931e
font_01_sfnt_off000109c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C7 11024 bytes
SHA-256: 7106af796ce3e4fda7f87e1f90d7e2ca99f8accbc8831983d531bd44de99d241
font_02_sfnt_off000122fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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