Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa765ecb67ce8866…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 14:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e1db5b5fd2320b20bd8b8f31f951ec35 SHA-1: 65fa49110bcd5c5ecf8aeecb1e6f0e591b7d970b SHA-256: fa765ecb67ce886690c7d6d380b7389b8f087b69d68892d14994f72a2eb806f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malicious content or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160fa22e792a09---86358050469.pdf In PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/ftdnofq7bcobcc4vlk84i15mff/bemorotimisunitex.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/butiresuwiligeximubaxolos.pdfIn PDF document text
    • http://vhz.cz/user-files/vurasujofolaxalij.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8ebe27f0b---8965127726.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/33952879726.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d1a7e27e8---gafutaj.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/zogekugelorixutojupaje.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/3qtanehe6neo3hmtepa7o023h0/woromabikemebawuz.pdfIn PDF document text
    • http://skncn.com/u/files/xawovu.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/10797557802.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/87453151279.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/dalobosipeza.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ebe2ce609---rezegaboweti.pdfIn PDF document text
    • http://kesifveotesi.com/files/4015904920.pdfIn PDF document text
    • http://garderoba.sk/images/_file/54504208739.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/4875033f5e25a741aa1024965a33e58a/55572050002.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/malozemijovidorozomeruzez.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85ba2734ab---murenerixumukevizipafemon.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/4v9a5i4k48do8ieasal77suhd0/98569619223.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/39d29e4cac47d4dfdc3e2cb1cb85c422/vixadovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=heat+of+hydration+test+of+cement+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_off0000d058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD058 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86A 19492 bytes
SHA-256: dc332729a6c1f8c799ba3c59980ca12e0746c252d2f02f0241fb2cffd9079db0
font_02_sfnt_off000119d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D3 10944 bytes
SHA-256: 0d4c32daa892d62b76a01b7d900053660b4c2f03d5da6cbebd9f3e75a9daaa51

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