Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e4776276fa53fd…

MALICIOUS

PDF

74.4 KB Created: 2021-09-03 13:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c15bc1cbe5ae68274b2e2ea435e70526 SHA-1: c983085ed69864c415b3a97688801ba463ec4b49 SHA-256: b5e4776276fa53fd2f4df763eb40c4a164fa13a95d06539cac6786966f12ed77
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm the malicious nature of the file, likely serving as an initial lure for a more complex attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medvor.ru/uplcv?utm_term=durgai+amman+songs+in+tamil+pdf PDF link annotation
    • https://domilot.com/uploader/files/jusaduz.pdfIn PDF document text
    • https://noddy.nu/images/file/40760022304.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fe0b552bb---gosut.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6cf94d14942c97e445bab0537502c71f/gidixidod.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b006bd8d9---xuzimolasal.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc3dbc80291---tozoxosubopasederekaluno.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/75670717976.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf86a89017---rugevajifujawap.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c553b07ee7---doxirofakunejadig.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/58520595110.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d83f6b65465---25659412251.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/jedivev.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/57893955389.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/netaxejevowagazebiku.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/1b7d6c5b01e67f65d48f8f6d49377cca/86403646416.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/oa026jvm029cadpiegkood9bl4/96293415038.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/porisuzugawan.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/lebiwezavazijemegij.pdfIn PDF document text
    • http://bvsaigonbinhduong.vn/uploads/files/guwojezerotul.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/97981649339.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/31408507409.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609467c3daea6---31187784114.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adb3eda877---jixafaloxakaxerizinime.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160917c2d0bfe2---77517990923.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_off0000beb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB4 17380 bytes
SHA-256: 8905d7b8d2494e8418dd2f76408b2f15cd4c57f40175b0ce6cd6e68180e5cfb6
font_01_sfnt_off0000eb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A2 10808 bytes
SHA-256: b460f18f10c813e1f8a7c63a53d41f2f10c86e503dd62fa916e25da82edbeb2a

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