Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9f4f04d0de7f2d…

MALICIOUS

PDF

70.9 KB Created: 2021-09-03 17:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a4eb59bdf57d40be3582a890be50bb17 SHA-1: d3e32fb591b7f5ea5b8086f8370ff0cb2c82722c SHA-256: 7c9f4f04d0de7f2db959db6f0f53ae9a5b6034c3a47f36f3586e8829e1fa4b91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://coretry.ru/uplcv?utm_term=skanda+purana+pdf+in+tamil PDF link annotation
    • https://alubiasdetolosa.com/files/galeria/files/xovudasopimoto.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/jozasezokanogogafaga.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e224db668---59598396186.pdfIn PDF document text
    • http://mp-journal.com/media/file/96435057711.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/gabikijufipapuxogimokozu.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/balajukego.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070785272e64---dabenaberajawawepuvesefin.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1078f74e30---11386604980.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53794293433.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/kupenidatukojolis.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/99cc77a45266c383fe7b1a96324cfb86/24596894744.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/vivoba.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/15541194625.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083edf31442d---zumamezafaxugetalidopen.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b867a85031c---zawotetapiv.pdfIn PDF document text
    • http://henrysadiereunions.com/clients/876463/File/radudixub.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/91307288358.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607478ff347c8---vexabekepugewuvika.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/80120475531.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612e659015437---8760023930.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_off0000aec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC4 18512 bytes
SHA-256: 8b7cd38ba9ec32aad1825e397406e6204884c447a1734a3c8c299b4567cf2509
font_01_sfnt_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 10504 bytes
SHA-256: b16f7b4575eade1bca87f1dc3e0718295eaab4825449e479c743f22c7ac5cd09
font_02_sfnt_off0000f665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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