Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd74cc101fa8ede4…

MALICIOUS

PDF

72.6 KB Created: 2021-10-01 16:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: dd483f9cb2cfcf8a092a606f0bcb088b SHA-1: 4a5be15f8482b05a085c716231d09ca89c6aa735 SHA-256: bd74cc101fa8ede4d0e347339132dd89bcba4d70a2ce32147e7169aea2b967b5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/74035092168.pdf In PDF document text
    • http://fine-cottage.ru/userfiles/file/romuwunezot.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/zajolasade.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/novir.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/17735648011.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/85021307151.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/51592086876.pdfIn PDF document text
    • http://bodamvientin.com/uploads/userfiles/file/jalofamudovixifebamana.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/66081625224.pdfIn PDF document text
    • http://zgic.ru/!upload/files/bunosifuz.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/fatimexipikafululo.pdfIn PDF document text
    • http://balone.net/_upload/file///mexuzaladuro.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109060038188409.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/givuvovukuvidodenop.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/0die5mi1gkaqnito8umbb4n5m8/sugedoz.pdfIn PDF document text
    • http://kccmaul.com/files/files/11695793868.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/8413116744.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613caddf38d88---dukebedelowez.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/9252286115.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d4243214b6---4685990025.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/64386414233.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/terar.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/rimuregawasubivimu.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/gudorigojutidusebusetebog.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/36793425588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=primal+episode+9+onlinePDF 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_off0000b534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD46 18404 bytes
SHA-256: ff7edcc9970a23a26f4424b05f11cceca3f68321eadd844c0baf79cce41e37f9
font_02_sfnt_off0000fcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 10624 bytes
SHA-256: 0aec29ad871958ced58bd8704ca76be5f24bcb8b3659497f5e109db08cdbd09a