Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bfcb63d55754f6…

MALICIOUS

PDF

73.7 KB Created: 2021-09-21 07:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a4b7a8972013459cc77680af8bae85e SHA-1: d6953c6c1a10d9f5650ec682d92d168fdf377240 SHA-256: 87bfcb63d55754f6c8564ef770436b6d045063edeeb21f8561e8172d6fe6975f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/bd01d4abe44c7a7bb3a734cac024b3ee/14086449665.pdf In PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/zomifopot.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/nemurobuv.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/7908632398.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/zenojifipuvu.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/92662558865.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/93801385928.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141a601a8800---ruxafivekeju.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/16480828505.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/67474474568.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/rifevevamigog.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109022316456378.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/kezarumipinewumorekovuvun.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/32958578599.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c6f347afcd6291cac473320a31e4f5d9/14349958654.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/jewagivopilete.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210909182507808846jw325.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/56119380765.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/68266592982.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210919090635.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/45065228815.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614755fbaa5c4---jefinidorawut.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/feborelejokizepirotex.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/13707032332.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/giragasarijep.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/vufajedofelukoxale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hide+mobile+number+androidPDF 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_off0000bd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5A 10376 bytes
SHA-256: ddd9bf034866671a6eed7a8cc73b76a1303dedaa1e9b72ff426d20ef2cd044d5
font_01_sfnt_off0000d49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAC 17252 bytes
SHA-256: 8e755aa4118ef4c1b782bf5bc2ebfab6cfe444fca1a335f5fbe2d78a172f304c

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