Malicious PDF — malware analysis report

Static analysis result for SHA-256 64716f26a8b52c11…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 02:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9382f2226511eb6b3adc1b269b1d5cf2 SHA-1: 687f5321c46741d28deecf53d345ad6a31d430a7 SHA-256: 64716f26a8b52c11f7864688b6e070a19d0582da9995af2d1c461f383d409587
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://urotunisia.com/uploads/FCK_files/file/55532631620.pdf In PDF document text
    • http://derivat.sk/files/xoson.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/32987544440.pdfIn PDF document text
    • http://webbolt.fono.hu/data/editorfile/goven.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/75590738359.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/tataweribolikuku.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/kadedalekogezavinagam.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16137f12a71b0d---14600892911.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/70871597858.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/9018922034.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/b6f1f239634582eb9caa0bba345e06fc/52332096661.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/96781556163.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/34021000094.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/fivolob.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/23127367256.pdfIn PDF document text
    • http://labradory.pl/file/zaxetekugepunawodudoju.pdfIn PDF document text
    • https://italvaping.com/file/fejubumijuzuva.pdfIn PDF document text
    • http://sushi-belovo.ru/files/rakugijade.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/puranamasu.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/38224720846.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/90639211989.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db37858468---62831288873.pdfIn PDF document text
    • http://e-sheremet.com/img/64515323729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=apps+to+download+free+movies+for+androidPDF 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_off0000af0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0C 15808 bytes
SHA-256: a6e7f49b9402e78ea1b9b2a6ec6429ee40febc9aa74c0c5e389ee10a28a3265b
font_01_sfnt_off0000d77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 10792 bytes
SHA-256: 8e05d879d868fbeabd6cb09af7b2a5b7e00c044e2d536ef09d3bc9dc0b519146