Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d0ab96e727cdf5…

MALICIOUS

PDF

96.4 KB Created: 2021-09-17 03:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 27cc7db1a0ea976339c8aa4bfe3e22be SHA-1: 5b3ca4d8d4adbd2ad5dc86f9b80509accc02665c SHA-256: b6d0ab96e727cdf5d3ed596175f516e7f8742701b86af9302c20fa92079f97de
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to its use in executing malicious actions within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://smidgel.ru/uplcv?utm_term=problem+solving+with+c%2B%2B+10th+edition+pdf+free PDF link annotation
    • http://omni-links-europe.com/images/blog/file/zimurusimesupikuwokeb.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/lufanefawusa.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/kosalelosinuzuxajegegefi.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/jixuwato.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/zenigolimamosajuwugojasun.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/56156776951.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140bac8864eb---pobetaxovelifuzowademaze.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d8eddfd6a---bowunerej.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/10269972685.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/72917917879.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/53954fc8cecfd1fe4ca1eac846e5b94d/1495938631.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/27930059840.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/kobepoterageverowojepoje.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210910011619.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161357f3097272---68294057566.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/85638809341.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/74281098835.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bace99f2fc---75200820286.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/vobubisazifizesazam.pdfIn PDF document text
    • https://go2germany.ru/files/file/biraxekozudisodakaxaka.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/kewuv.pdfIn PDF document text
    • http://a899.net/userfiles/file/47280447606.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_off00011051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11051 18620 bytes
SHA-256: 36c5ec24e5183d5bf3561899fa793f300b5eec0f06a843e3d8c330b2ed0098ae
font_01_sfnt_off00014170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14170 11372 bytes
SHA-256: fc71cbd217920b55b3bb40d41a9a745ae2abf8e0b309a80f013d19c6ce8931ab
font_02_sfnt_off00015baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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