Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc3eed34f11c145…

MALICIOUS

PDF

93.4 KB Created: 2021-08-23 18:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 4f5279475741d9cb31b88903645a746a SHA-1: 0211f654218d27fa9085095c74ba6c8a48c75c47 SHA-256: 7fc3eed34f11c14595eb13249a185776b038eb9a7f1981f87501acd0bd165cee
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. It also features numerous external URIs, many hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebb1e7dd78---25287468690.pdf In PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/zofenulegi.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/79797823835.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf5fbdf68---miwazekiwarizaxi.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/2da5c251eec45fee0d3b9f13048dbea1/fisamipugetafoxigiseliz.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/4ad3b9d87d4060755d1b56aa94416782/6870518008.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/97196745000.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/2fb910e0e765ec88078fd7c1aa1a39cb/dimaxovaliwagunijano.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611de15510e1d---nozemaj.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/masojiritamag.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/92333198718.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/lexidunikevalavo.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/31aef2be4a3415c1da7a9a1c7639ef9f/61433324376.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160932df60323d---pawiduviser.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070695d59170---97165728450.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/fubojodepevokurusaliwi.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/94983866543.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcd67dfc66---nukoneliloluwinibevamoz.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202108100501295435.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610d4bbee1526---xamesopoledigaxe.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/58383797275.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16111fca403144---35894616898.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/jasaforajurowi.pdfIn PDF document text
    • http://yljczl.com/uploadfile/20210814215522403.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/jegamex.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/87300490473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+science+and+fine+art+of+fasting+pdfPDF 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_off000108cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CB 10816 bytes
SHA-256: 40cbf3007ff43d7106f3177f6f2b808216273d152ec752cad17a07cd914afdc8
font_01_sfnt_off0001217a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001398c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398C 17748 bytes
SHA-256: e7d7d7a3f0faeb1688f59169c642d97dede56ea1da65d78e0f23323d7799fc9d

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