Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2eddbc45eca4163…

MALICIOUS

PDF

78.3 KB Created: 2021-06-28 10:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 806690c94907b83b4866e606aa0f5306 SHA-1: f4ba5b630a76047e9980b654c15f2715ebe406c1 SHA-256: b2eddbc45eca41635f86a596778b2fdb5ebf4d7f3b154f69a0563ab76c16e263
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 6

  • 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.
  • 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=crooked+creek+camp
    • http://edgecs.net/documents/megidofalesunuxiwuv.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/ec15ddf3adf3bfbf1749569fcd7ff04e/wetawaxozimiwusivudu.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/99d2a9c7e151f8625b21b8d5567eede6/36716077700.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7e63c306e---puseranevupiv.pdf
    • https://bloomeng.com/uploads/nerubodijumosanek.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607cceb6b0d69---12164525117.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/weberusap.pdf
    • http://whalesart.com/uploadfile/file///2021053010474914.pdf
    • https://loctra.net/userfiles/file/turitepawamabe.pdf
    • http://blessingsngo.in/userfiles/files/57683970967.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb42f34bc4---pogasevobekafazivuxepogan.pdf
    • https://vestol.bg/files/file/67035246082.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb2fc4d53b---kuzarekegosivuf.pdf
    • http://vdadanang.vn/app/webroot/assets/files/jabigivesekatenezadejesif.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cd1932d08---zomagagabonosukuteve.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c5fadc91446d79efaac34b1b493c8fa6/81720524614.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ef5770d1b---62352908263.pdf
    • http://sivam.pl/files/file/novifizowanogopama.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84d9a2b71f---kakatajulokuvezibaberalow.pdf
    • http://4bx.pl/public/file/89766474844.pdf
    • http://seoulsquare.com/userfiles/file/67304650070.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13b211c936---77660581685.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/9h9rblo8tfbtbi3scinb4cf7k3/9249143879.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba9e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9E 16792 bytes
font_01_sfnt_off0000d2af.bin
776130869521a0c3c108b57d253b17febb5ac56de7b1340566e345a397dedac1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AF 16268 bytes
font_02_sfnt_off0000e8cb.bin
4f0fa91f5706eb4322527be69b4960a8c4f2c8d43551d8f8daeb80441fb4f059
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CB 10292 bytes
font_03_sfnt_off0000fff9.bin
32919ccb7a15af396568501e16acf1bcb693004b3544aff8571b29dc4c32cc1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 16492 bytes