Malicious PDF — malware analysis report

Static analysis result for SHA-256 344c8daf324f96db…

MALICIOUS

PDF

87.7 KB Created: 2021-09-17 21:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d05513ae36f26c8e8c7644b9b629144b SHA-1: 86eeb74911a996031e73872ed5449f561d0a4a34 SHA-256: 344c8daf324f96db05c69b19b21ccb22b9172f3910f611254e2abc5140629e63
196 Risk Score

Malware Insights

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

The sample is a PDF document that employs social engineering by luring the user to install a browser extension or update. This is a common tactic to facilitate credential theft or malware installation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lead the user to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://namdolove.com/FileData/ckfinder/files/20210901_123AF2C679147857.pdf In PDF document text
    • http://autoscuolauniversale.it/userfiles/files/wapawuvepupejobezisor.pdfIn PDF document text
    • http://lex.tj/img/file/botilutuninixilev.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/jopupizomikanolelemerikug.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210906_043555_191.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/kujujaxukedubalefizosurop.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/3o5iomg4noouobbn52o9q7ngd0/21537694000.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613deb7d426fe---54116523153.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/98999510773.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/85466043209.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/2b9f348f7785c5cad75e005eb1d43bdb/pesogoz.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/nolatesoxasutogivewupe.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/13965728746.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/tutewuwubudogezeteloro.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144bf94b9b02---20453892337.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/zowerolozujekize.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613082cc4b8a9---nimoxavejovafimixaso.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/13423360263.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/vevolanefozi.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/b54e0587eb6dec5974b82e7b645f4205/bubitirewekofa.pdfIn PDF document text
    • http://tyextractor.com/d/files/niwitizajaxokumunonunar.pdfIn PDF document text
    • http://thepducphat.com/upload/files/46069133646.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/59637106094.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/75941118428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+do+you+screenshot+on+an+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_off0000ebb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB4 10712 bytes
SHA-256: 381ddb4b2bcbbc63d121a0cbc5c70f459af87e8149ca14bde236949eba72d302
font_01_sfnt_off00010446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 20528 bytes
SHA-256: 79f37aa547860906ea35fb36c265f42adb65fe88446ff661ae82d845dafa6fec
font_02_sfnt_off0001390e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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