Malicious PDF — malware analysis report

Static analysis result for SHA-256 67cc72989cfbf506…

MALICIOUS

PDF

88.3 KB Created: 2021-06-30 05:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e529ce7f0f75fcd5a799ff9252c85020 SHA-1: 4439a8af95aeecd0b82c7ad82851de48d7f634d0 SHA-256: 67cc72989cfbf506b052ee2f1199a33d8169977d9f8d90787bf507eeb7f4b8fa
164 Risk Score

Malware Insights

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

The PDF document contains numerous links to compromised WordPress sites, suggesting it is part of a phishing campaign to trick users into downloading malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or exploit. The presence of a visual download button further supports a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • 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://laborke.ru/uplcv?utm_term=cv+format+for+mba+freshers+pdf PDF link annotation
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730eb5538b7---vuvoxuvuninoporijudifag.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ik289co5nacf66d19j2c0n5977/60273999236.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/rmu8m7kve98gga4kflls5eemac/diremawipugefazoto.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2750c77391---47685861371.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/38334506694.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/eb56b2d40ad8e4808b7983f676fa8a61/bumoxufodikomebiremidagox.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609891166b704---15675493710.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/tobilotolimowuv.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608503bec2c81---63910106031.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/51043790530.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/8ac8fc5d7061e852b2e68aeb8e3515ae/70574732955.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/3c60d5f1d2534a2c94bf0f7afb3db7e0/dixunupupudufesudesokor.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cbdfd4c5e---lawadijofakibi.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/a5bc147fdf78b9e5c253853e23eb6f48/redegibafaxafuvefiz.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160861e99f35ad---mugeme.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/965b22m4ao98mutkor5jn5a765/fixodorenimol.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160813c38867b9---pepos.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/97554619647.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c86cc188c67---99927850040.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/lsmdlk072l3pikkrppge4ekj2q/wimugakadizunubuwu.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ab5fa0f86---85588638058.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703b9bca8a2---41642931327.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D0 20140 bytes
SHA-256: 460be63fd749ee3985d158f4fd80a40f0a020f90a1701137114e2422dd5b7e02
font_02_sfnt_off0001398a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398A 10760 bytes
SHA-256: 8c9f9d60c1fdabbf6743b61b1873f1463d8ba9f7305b8dbb24a73705ea45d3a5

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