Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b65c74de30b6b50…

MALICIOUS

PDF

76.0 KB Created: 2021-09-22 17:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5a51c58fff2ed9e4378962908c7bce9b SHA-1: 2b83618d00b4044b4352579d6d7a378584e4c0ed SHA-256: 3b65c74de30b6b50ead86dcc9c1db18e0be7f51b0316f9973c4d879666c91028
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS upload storage and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users into downloading further malware. No scripts were extracted, but the structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://anpo.vn/upload/files/kaxatepijibusa.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614093f26bbfc.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/jivawilebifulu.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/pakamejenegutegoloxam.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a922f41788---pipunutofanixil.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/berivibagokukagarur.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/jalevavefaraxo.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/mugalu.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614192cf1eb6f---19820640545.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/voraketuvikedil.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091807134880.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/belidotaneruwinuragit.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba3d44688---55345015523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=dls+16+apk+downloadPDF 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_off0000c5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FD 10364 bytes
SHA-256: 7d26a225cbb7e3db2423e778d775b65808545a037cca47b8dd32299dbac826be
font_01_sfnt_off0000dda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA3 17868 bytes
SHA-256: c5f05cd62f8a3785aa544ca138fb3448d8dc477a0a37811465c18dc5783ba8a4
font_02_sfnt_off00010baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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