Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b78e2c2ebbbc845…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 16:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 56deb73ce0bad7e94baa52f53ae96447 SHA-1: c1682e0565f9b16f672020fb533ba6a74a55d5ae SHA-256: 8b78e2c2ebbbc8454a1d63b786f6175dc4609dc520e617bf0cf2d4fa1c11ea96
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' points to compromised WordPress upload storage. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 http://short-story.ru/upload/file/18255823056.pdf In PDF document text
    • https://pcetravel.com/files/file/rokusaxosuxesorulum.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/6732455276.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kisamufuzoxa.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/12166199512.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/lefalokexobofewesobaja.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/nirugawosimotek.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613557a00d995---38137407464.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd23c48ab9---60297274211.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210908061552_Nzg1NTIxMjY3NDU=.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/guxeliguwodasige.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/73666093117.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/fipavobimipururumiduju.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/jekonoditajatexononogelox.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210908_EEC041C1E1F78F29.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/fizilovuraxudet.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/viwuzidoxo.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/52415154528.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/gosinagul.pdfIn PDF document text
    • http://idroter.org/userfiles/files/fijanejajegipo.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/dasazomi.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/dulejuzizowanomasab.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/zupupowiwanuvutokadozedol.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613be844e94e9---93045460957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=gta+5+download+apk+obb+filePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000b71b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB71B 16244 bytes
SHA-256: 9229bde5e3614c940ebb387a6affb910e6b09cdb82f6b0ab59768fbd23138caf
font_01_sfnt_off0000cd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD07 19692 bytes
SHA-256: 9d8542b91bbf0aaad5f91c6aed9757e1568538dc99900c2e95bf27827ff4fb17
font_02_sfnt_off0000ff63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001177a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177A 10712 bytes
SHA-256: 6e2c8d166027c45fd19a34bd2401efeb38b862c29b59edbd40b596eab3d9ed70

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