Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe6c74b863ac099…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 06:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 23ffefb19ed9c7799a83ea0c68d8768a SHA-1: 96420d27a78d35a42b1df13525b304a0b3c57438 SHA-256: 5fe6c74b863ac099416e3ee3a5f8421716ccde42933947dd2a4b3f5a3b8f930a
204 Risk Score

Malware Insights

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

The sample is a PDF document that contains embedded JavaScript and multiple external links, many of which point to disposable hosting or compromised sites. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser extension or update. The embedded JavaScript and external URLs suggest the document is designed to download and execute a second-stage payload or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=download+tiktok+without+watermark+android PDF link annotation
    • http://medica-eg.com/userfiles/file/86782533766.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/79693702343.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/91456817063.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c813db22b---junenanit.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/21479938767.pdfIn PDF document text
    • https://tigapilar.com/upload/files/44110500230.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/93911236734.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/17498007575.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/14608588839.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422d0488dbb---nibazekubilusofilinatamuf.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/xavabenebodowaj.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/bexajoradunajigosofamo.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/gekusuxo.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/31286859594.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/werimowo.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/tofozeluxifiwa.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/38521559455.pdfIn PDF document text
    • https://parfumzone.ro/files/file/9683693807.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5227c66dd---romezozunufa.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109080757007637.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/qlkaf04k0suafbbvof9rb4rhj7/vuzugokega.pdfIn PDF document text
    • https://podimercrm.com/img/files/nixokazaxatawuvigup.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/kuxan.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_off0000e064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87B 10624 bytes
SHA-256: 6443e70121be8dfdf33d3b11c7c7810bdf0a737451045fc177aaec6db6c393af
font_02_sfnt_off00011090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11090 18304 bytes
SHA-256: 6950991343fbaa8e3084e61ad2fbd2e7582622316c9f4d6cefc0167aef7d4b30

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