Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab03db2628991090…

MALICIOUS

PDF

72.7 KB Created: 2021-09-30 11:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54f0ffeb3cbaef4a5665c55e40059faa SHA-1: 554d09e642e5e594ac65e895118316a47b14dd3c SHA-256: ab03db2628991090059982071cda482ac29c2589ec9e9b2828d862f2c882cd5b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=remote+android+jobs
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/40882676160.pdf
    • http://aburobocon2019.mnb.mn/uploads/files/58658570425.pdf
    • https://thebookonpersonaltransformation.com/FCKeditor/file/7406931040.pdf
    • http://oprandi.it/userfiles/files/mibogirisefominomutajav.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/44817798814.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca430827a5---zatibator.pdf
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/nitepimusetegopefikowumaj.pdf
    • http://alfatreyd-mebel.ru/archive/images/file/vekifetakenazedutafin.pdf
    • http://checopharma.com/upload/files/21592587080.pdf
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/kowaz.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140be0572307---90509592820.pdf
    • https://tramtron.vn/uploads/files/files/zubajurevoluboxitet.pdf
    • http://merrygoldholidays.com/ckfinder/userfiles/files/nojituxusufenewani.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c546b9471e---76898707467.pdf
    • http://theseadiaries.com/ckfinder/userfiles/files/17302053981.pdf
    • http://pvvc.cz/files/52026939747.pdf
    • http://tokyoto.pl/UserFiles/file/xejamonulejilob.pdf
    • https://www.solucionaesp.com/ckfinder/userfiles/files/rodeb.pdf
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/wurunenagumajidukuvo.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/928d47ef1a1281458cfe634c4bfe7862/23830276479.pdf
    • http://szyldkj.com/luodan/images/userfiles/file/jonajat.pdf
    • https://baxsporthorses.com/userfiles/file/jenaduvusak.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b526.bin
50d278a7d223726c736869eb2ff5e3aa393d961452697f2c1100966f3a1f4a61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB526 18512 bytes
font_01_sfnt_off0000e4fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FD 16792 bytes
font_02_sfnt_off0000fd14.bin
76166cd02df0b2948c4c1d6fe8fe1be818938180e21cf322c40ee4027abe805b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD14 10676 bytes

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