Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08117719736d761…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 21:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 607401a589c92b20387ed2d751d28da5 SHA-1: ca1513cc0e4793f6b200db2ae51dff61685a0904 SHA-256: d08117719736d761ba943a0f6557109640d2af00abbe8749cddb590a79e48a36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute further malware or conduct phishing. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/80ba4fdbd71cddc280b6f06a018be04c/92534981996.pdf In PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae77d210a---30578311251.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210915175937.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/arodokobinun.pdfIn PDF document text
    • http://huntland.hu/upload/file/tugivinokokasafow.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/96319212533.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/465aba94524f88785a89e3d9437dd192/74373110675.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/30966041087.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/38993869481.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/96122646463.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/ripoja.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1868339999613adf5eb8f58.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161320f0c7843c---84002726665.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/zetizelozoxajumakib.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/12130239770.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/diroxuvefijanakiwegagede.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/pajonedubotovibafixo.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/siregokesij.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///21707181863.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/6369fb24b03fa7e3faef7833c942dafd/66118329799.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ibftdbpimcde0lgvsjgpc4c660/zevatemozujilomesiwami.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/goduraseb.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210910_081215.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210907163208.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/barujidibixodon.pdfIn PDF document text
    • https://phunhai.net/upload/files/36845103031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=what+is+vpn+on+a+cell+phonePDF 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_off0000e06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06C 10428 bytes
SHA-256: fdc2ecd8c81c79aeafc721109bbe805267282c9c0df95f38e4aea217d7ab0314
font_01_sfnt_off0000f80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11020 16288 bytes
SHA-256: 45fe7720899bf1a5960e830cc96cdb5044ada70413bb188dab5f83c83cd85215

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