Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5db2970f304d38…

MALICIOUS

PDF

99.7 KB Created: 2021-09-10 15:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e8e90e26355187c5405017062e2e0735 SHA-1: a9509a2059b8faa212f6297100a476142d1f4ef2 SHA-256: ee5db2970f304d385cdf23fc239701b92132e3aec09590b04044ecebf794891e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to websites hosted on compromised WordPress installations, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c3cd93677---67902358634.pdf In PDF document text
    • http://mikailang.net/userfiles/file/20210908121407_93218929.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c2c769c8d---74230647596.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/3c88898921efe5781a993a88f07f7306/sesoradolivunipimogig.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/40699363302.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/tulezegolilekakol.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/pizenunomogek.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/kowipanenifagadibenezukit.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/88577608602.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/nupunokedagosiwogavosibe.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/58100428538.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/16173638308.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/vuzudijutulopi.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/vibasizesemezavagibisega.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/vedefelodokekig.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/wuzevekiderexesos.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/30849019444.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b179786ed5---xinelunemigufadepamebam.pdfIn PDF document text
    • https://stormester.no/files/file/vutoxidojejaxazerivuv.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/nipemaku.pdfIn PDF document text
    • http://chineseclothingonline.net/File/kipirumafexobivuwi.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/37616631189.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/29206064961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pokemon+soulsilver+gbaPDF 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_off00011507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D19 22260 bytes
SHA-256: 053f2f62d8687ba7814071e7581ca31073e0f0337a745f1789e8552d3ec24f85
font_02_sfnt_off00016737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16737 10752 bytes
SHA-256: de6bd42697749343681ff17b18bdbd245a6441989ffbd401dd6761d008fcdd32