Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77f1ed760015093…

MALICIOUS

PDF

90.7 KB Created: 2021-09-14 07:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: adc5efc72c62ec1cf963f279765c5dd1 SHA-1: 0a2d8eeffde98c011338183d77e9da8df57ddcfd SHA-256: c77f1ed76001509391d7aa90f42b5a05ec07aab612f7fe64d1441326c63afc91
216 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, specifically instructing the user to install a browser extension or update. This is a common social-engineering tactic to facilitate credential theft or malware installation. The presence of multiple links to potentially compromised or disposable hosting sites, along with a high ML classifier score and ClamAV detection, reinforces the malicious nature of this file. No scripts were extracted, but the document's structure and embedded URLs suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://starfoil-mail.nl/uploads/wysiwyg/temazabujasom.pdf In PDF document text
    • http://kocavietnam.com/upload/files/lugogajalinodapivegu.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/5571933031.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/vasenigoraxuko.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/52398894385.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/zelowekiwuwes.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/xapilaforimegefemijiv.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/67975241943.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/80804185458.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613042967425b---83597165566.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/puwatiwa.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/xoripowasunabekotajewe.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/zuwowejodedajas.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/31283450748.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cacd5ad855---rikodimovukifoza.pdfIn PDF document text
    • http://santeh.md/img/files/fuxonif.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/magosegoz.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/modave.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/togafidusavawopufuginofu.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/c579cba8aafffdc03eb7d617313b6dee/kikube.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/49667197209.pdfIn PDF document text
    • http://proxima-online.it/public/file/lanufetalezegolewesij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=best+light+browser+for+androidPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/lipamipimisolizovez.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_off0000fd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6E 18148 bytes
SHA-256: 99828602f7e6fa570263420036ebf03095e4d767e58d10dc5042a7ed144126cd
font_01_sfnt_off00012bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF1 10912 bytes
SHA-256: 0604484471cb02689b62d222b9e8c3b9bd7f225e9b789ad69fb9fcd5f9c453c5
font_02_sfnt_off00014501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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