Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1549d9c5bafbb16…

MALICIOUS

PDF

93.6 KB Created: 2021-09-02 17:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ece49d7cb8976edb0dd6730eacd8d29b SHA-1: 5c0a575e1ce9a9391c90113d72e1d8ee376bb47d SHA-256: d1549d9c5bafbb16d43dcaf2f74daffe1f8f82abc7eb4b8207b5b98c962494fa
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://drafthe.ru/uplcv?utm_term=heladera+whirlpool+wrm48d+manual PDF link annotation
    • https://footballsod.com/images/ck-uploads/files/temobesu.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de0cbbd3463---27380886175.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/nusoloxofejekikajokizefe.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/64f5f8bdbbf2d05e0e823dfcf891c3d3/8244771995.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9c3e0f9d8---ronijurebevexitipozuna.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/punagada.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/lafusefuwir.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/foravorowu.pdfIn PDF document text
    • http://spc1962reunion.com/clients/c/c5/c535eb5d361035e84cedf1152ec4da8f/File/10539738542.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/pinerenupigeruvudaxax.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16124ac19bfb1d---49375568669.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a02ad76d9---fidamukojiz.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/rujarevewigekovu.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af81b21f3f4---sevijomojomirogitegige.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e676c75fb71---ruxozufagolugadanurilot.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/f533e7de308b0a22e6902824b4cde7c1/lobegaxesolop.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/wixesav.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad93496893b---86351527738.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/sizenutir.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/kujabosiru.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/88659027644.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/f031f1189a9ebdab3ebf8457c935b134/vufuwogebazawe.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a619871d547---toguruzovoz.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/bozigozagek.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_off00010371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10371 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B83 19924 bytes
SHA-256: 415985d577d6038379f34a2dc33776512c3c1b85a94a554aa2fb37e21b8724a9
font_02_sfnt_off00014fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FCD 10856 bytes
SHA-256: 44fdca527e24362b134f69bb52ad1630466b6e303e17e9db7fab5d8288f60f00

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