Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8b8a97a3433e40…

MALICIOUS

PDF

82.1 KB Created: 2021-08-26 05:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 53af13283e0c7421eb44395fb2083579 SHA-1: c804e347872deddc45188a1d8c1bd27912bb8374 SHA-256: 3d8b8a97a3433e408b954ab1b357574908eec43d483003a066cbf65d47abb22b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=gta+san+andreas+download+free+in+pc PDF link annotation
    • http://urbancollab.com/userfiles/Proj_Name//files/25846084640.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/4554527660.pdfIn PDF document text
    • https://cargotavio.ru/files/file/zifotagobomisidut.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/43i5qepqepi7qh0fctucacjaap/buvafinubakukupiwu.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/39327810912.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d65cb1de---2983708203.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/lewuxugi.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/bipurudowukejotenewojutu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f76a5cbaac---wubajifa.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/luvije.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/dokujobo.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/xakujimiwis.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/44604868518.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bf9e9d8efa2---79545081406.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/15418980002.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210723_172323.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc08cf23aa0---97063006668.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021080804170222.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021052814403113.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/xurigobawi.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d898e1d1f10---4877848196.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/99391644647.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16083e15333c98---88772810291.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_off0000dd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD56 10736 bytes
SHA-256: 2c0a320dbc2f01a05bdb8986e8523119bcba015b798f104a110cb7c65bc56942
font_01_sfnt_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 17044 bytes
SHA-256: d254d3a6284c7bd3d1d292887380062614a3fd7063580478a24edff822114104
font_02_sfnt_off0001227f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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