Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5764f487251fb6b…

MALICIOUS

PDF

77.9 KB Created: 2021-09-02 21:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c5758ffd7ab8f505eb5f7498584278f9 SHA-1: 4006113edbc641f949f1d9daeda55dc445038623 SHA-256: c5764f487251fb6b6696efbac107081a973917bab2455b3f68cb4377de1ac6a3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests malicious intent. The primary function appears to be directing users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://allytemp.ru/uplcv?utm_term=etika+pelayanan+publik+pdf PDF link annotation
    • http://prestopc.it/upload/file/fadiwovikatisirodekosi.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611d40b8ea9de---53761551078.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/85657781042.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/d487b5168fb905bf949769b52cd1b703/15260888090.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/vinugixob.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/9d6c7b61d25bcc2079b2b24beb09bf16/56663266699.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3766f287---verojejogozozajagisipa.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115869548571---kobalitaruzifijeludewa.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/39836308334.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/moronepomil.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/wolakigilevikug.pdfIn PDF document text
    • https://faceless.me/userfiles/files/88176689480.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/nagetafujaworusepazonumax.pdfIn PDF document text
    • https://novitas.ro/files/50482921700.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d3bd4b941---23685020084.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a1ec8fae5---284473220.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/3c405429fefd426eedd0cf1a2c88d8fd/4422886836.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/6531315950.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/xajejetutekomobatuzeve.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609592e99c4e3---30812581174.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/xabex.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E0 10532 bytes
SHA-256: 44c015a0430a2db90eff9d1a8bdc557861a074d2e3c487732e5b5fccd18bbb24
font_01_sfnt_off0000e8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 16140 bytes
SHA-256: 58205fac4ca1bb2aca5b58f70256b8dadad8ab25a12c3f1b555e41a1ffa3df59
font_02_sfnt_off00011281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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