Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba643f48d948b0f1…

MALICIOUS

PDF

105.9 KB Created: 2021-09-20 06:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 48e067bfd69bfaaf5ad2464489f4e826 SHA-1: b20b81a8d211f800ce0abd770fa686369f888497 SHA-256: ba643f48d948b0f12673b67cc7ec74db7eab386ce85a9ecb74d49162f181a94b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed to redirect users, and the ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://pistant.ru/uplcv?utm_term=wheel+of+time+book+2+pdf PDF link annotation
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c2c7040997ebd0f752d4f02a9e9527ce/texesov.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/nifudovuwefavis.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/2nfu1350bb3cp9mfb30hfhlri3/bevum.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/39715618922.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/14810445532.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/nasajiwadotajuvopikomemut.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/towolexirutadap.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/powikag.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109041021432817.pdfIn PDF document text
    • http://yjccnc.com/upload/files/11898706094.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/nomulifabunajatuzorolide.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/36794425334.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/xuwami.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/92161610679.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/rimenuk.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/2483010928.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/75508707457.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/maxaresiwewe.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210903070808.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/89737297132.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b393c2d3c---78325162113.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/zukobi.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/veretupuwapimif.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/53888012609.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/81245961724.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_off000138b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B0 10576 bytes
SHA-256: 5a8d4c2d4a6b598612f5a482105d72b258f94ae82b15ab3da415454a5c40732b
font_01_sfnt_off000150a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000168b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168B3 18752 bytes
SHA-256: bd4d087611e5c80fc8eb5faa0453e4b2e9c40db2b053c872223a97e723646af1

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