Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f36ee54781b041c…

MALICIOUS

PDF

199.2 KB Created: 2021-07-23 23:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 45406667ed505b68c21d4fbd92318159 SHA-1: a013a6e7726710f3e311ffdf481a3581b51e7486 SHA-256: 3f36ee54781b041c85bbde6852677dd41a8010b4980a7fcac7e5e83ac397afb2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/o8njg7kb1j0gonbarnbqv0co0l/japekazazikixajogepok.pdf In PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087357dd60f8---nobugiburikoza.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dadf24c05---8742054777.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/tusikuguzonax.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/sipesi.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad398fbbd32---90704199844.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a378b7b3a71---70087493089.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/57341190424.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/2c326470d6453f042eb8c3055c0a4c96/11410386805.pdfIn PDF document text
    • http://polkovnik.su/upload/file/46411151224.pdfIn PDF document text
    • http://93564497.com/userfiles/xesataninadisigiw.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/tvv8ptslcf685uqca60n086u56/somisokik.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/70135761318.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/xosolakilupabiloraxukib.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/zofud.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d9e39ffad---82185899851.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/cp3gtjekh63ctmk689e0okblt6/pedigukoperuvorivirowuv.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/gofowabilivewilefugapuleg.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085375be52c2---womifas.pdfIn PDF document text
    • http://samtekelektrik.com/files/45155213499.pdfIn PDF document text
    • http://dejede.com/userfiles/file/59645914458.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/rovopapo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rqa2kre3g6f7u4v1us7hscqv37/64177469870.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1d45403f4---xowesojewerinatu.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/96126696526.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63cc88d8d9---zifusijofovuleleluzatorut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=distance-time+graphs+gizmo+answer+key+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_off0002a7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A7AE 11408 bytes
SHA-256: bcac17be6700fcaf80c5855d83afc371f116afe2392f623e3d0cd612761056ed
font_01_sfnt_off0002c25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C25D 19652 bytes
SHA-256: 423c8ca412825c77fa15e4984a7eeb6d24b60dfa682d06b5d70ec8d923a603ce
font_02_sfnt_off0002f64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F64B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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