Malicious PDF — malware analysis report

Static analysis result for SHA-256 1064c3068c9d19ab…

MALICIOUS

PDF

87.6 KB Created: 2021-07-20 10:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 77d5d7849caec19b0b218cffcc866539 SHA-1: dce682a66edb0f56b044ea5643a71041fb9386f4 SHA-256: 1064c3068c9d19abbb02fac5908d0e703b86e9e75f3e3dc8d90c0e2756db17a6
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous external URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://doctorchina168.com/upload/files/6491626583.pdf In PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/a1c8241067d3d15c56e995d03a3d0db7/18859522087.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/e817e77c022789ad0383cd96bd486f65/46711513944.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/94186513286.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/dinozilipaz.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/94422713330.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/xejaretav.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/13f85d20873fb4fe5b9e555603a2db39/61960932309.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/05b98fffdecb581589a0dcdbcf0507cc/dadegedozupuxu.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e31303e58d---boviwefakap.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/zotilenawovoro.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/43610276579.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/51282658390.pdfIn PDF document text
    • https://beaszemin.com/files/minoromajodo.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mcles3a40qp0ot6f4k2kq113k3/wukatepipapozinozo.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f20df31435---11986870392.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/fosadudiloviwebaxadezim.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/67469509832.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/97689413830.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dc98bc4520c---39799178494.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/tavuxegomagu.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b1362b079---34795986019.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/fasavidikekagevenevor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=htaccess+mobile+redirectPDF 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_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 10556 bytes
SHA-256: c807691dacd3e417c5c8226b9fee3e6b3f5f24be9b19db71628c835ec31ab4fd
font_01_sfnt_off000107f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F7 18552 bytes
SHA-256: a046edd9842a64aad5d56336980856f91df9cd63969f2092b3dc794dce60fa55
font_02_sfnt_off00013957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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