Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d46736060b7e580…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 09:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1daaa54b8c6b4a29ac4f59d74d64bb05 SHA-1: 9380f538c1e1d8dd3355a01e25eef5fdc6655d80 SHA-256: 5d46736060b7e58001ca7f25e3ba7c56a18eb7eeeb051f6ae13820cd700f4fd6
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a browser extension or update. Multiple URLs were extracted, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ylphs.com/ckfinder/userfiles/files/vusuki.pdf In PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613552713ace0---30236316942.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/6b218a781160c93a71f474823c2eadef/86429926309.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/kofuronijifunaxelojowe.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/zolowamarowemuxovu.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/kukebebakikisibipo.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/fd129485df85f591714ea5ead76b7f82/85397064281.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad6345661c---61762562923.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/refosowuxaluzonuwiko.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/bubetodifegazu.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/kajuremapegob.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/57903579746.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/27687109625.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab043b045c---joxizatupalapata.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/tireforaviwujanaz.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/51665214391.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/14348872586.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_16_01_14_01_6184.pdfIn PDF document text
    • http://tfforming.ru/d/files/kiladuwonutesat.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/rudijejejunasenuzezojifeb.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d820bc75d---ruviruzivubizowavavarapo.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/dffe6c251911826f769268ae8e0512e5/belewogufuwusoxuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=can+you+see+if+someone+looks+at+your+instagramPDF 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_off0000dcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC0 17240 bytes
SHA-256: 6a4b472549a1b243543b1d59c6fec4d7658989d0d06f1bdb726fcce72c216477
font_01_sfnt_off000108d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D9 10896 bytes
SHA-256: 96fdb82ba47c08ae5b5c1f3de05c39e69ee2b505ca5c43f3904318082b890339
font_02_sfnt_off00012221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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