Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71b022fcc9495e2…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 20:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c56e2f7b83b28871af4dde114688aff6 SHA-1: a51e1afa8d58ed74e73d4aa21212e64c8a0cdee1 SHA-256: b71b022fcc9495e206522e2c5f70aee38854ce37704f84a546ab8d1a32f28b26
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive handoff' heuristic strongly suggests the document is designed to trick the user into downloading a password-protected archive, a common tactic to evade security gateways. Numerous URLs pointing to potentially compromised or disposable hosting were extracted, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://tuttoadomiciliocn.it/file/nofupojazizamemexenada.pdf In PDF document text
    • https://mobspace.xyz/web/img/podborky/files/wazinugedanuvorenoto.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/8709574173.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/99502895688.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/34644e2acd35b068b1beaea1eb8bf82a/gejemojinurijutitavutif.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/c0f448a59f689682c830ab6e56011f2f/72332912189.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16071957f491cc---munan.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/bufegotinixodafasufi.pdfIn PDF document text
    • http://www.empresshasnoclothes.com/siteuploads/editorimg/file/xujageteritiki.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a17691f73---10937009804.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/13618fca619812868a97f717b559ca75/retulaxememekisi.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/87019439322.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/pimidiselevuzil.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/widutiwixemade.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e63ed10566---44084997976.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/50695877905.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13abf499fa---vujekorosibomapile.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/34933348260.pdfIn PDF document text
    • https://megashina24.ru/files/files/80516568620.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/88520438662.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/botuwigefimetugep.pdfIn PDF document text
    • https://media-get.com/userfiles/files/delugevo.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/ir58065b89fg4jdfu6f755ebgu/votinusadewude.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088235a78801---17618763161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=chiffrement+sym%C3%A9trique+et+asym%C3%A9trique+pdfPDF 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_off0000d9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FF 19080 bytes
SHA-256: f6a9d5a4b1d65c4512918d128ec807226e823d47697ed3040cab672221cfe55f
font_01_sfnt_off00010a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A12 11140 bytes
SHA-256: 91ff170ec74a4fa58a18db0f72252f2340a0ff14e3673ca05a173e0801b45539
font_02_sfnt_off00012379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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