Malicious PDF — malware analysis report

Static analysis result for SHA-256 967b51ed71cf2637…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 07:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58f3043b8d2e2756e659c07fabb164a3 SHA-1: 38d913708a394df2bc5f3ad4186350994c8bbc5b SHA-256: 967b51ed71cf263752a9a4ae40274be56c552352e264459ade813d92f311a755
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to host or distribute malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1ae389043---bakomisenivamomuged.pdf In PDF document text
    • http://daoltrading.com/userData/board/file/40090166393.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/jerizakefaderelilisu.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608401927fef3---sopafab.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/98855971860.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/33708412919.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6387e54b---98569993229.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/wokapizapumadepevejivitu.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/lerefixutobofuzadukose.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021429201428147.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779b7686bfd---42061651314.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/c2b7a5765b56334eec017dc9393de93e/xemiborowusuw.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/574f1cc01e50be46bfd9642c14da6c1c/dimasomokumutanax.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b66e0351ff5---gusoxubunosewagekuna.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/tadoxeruzif.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e1c47a8c74b469b1e01c8cbc891e6f05/malomupobe.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/56563702345.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079107d2a93d---58580489378.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/gujirelesibeparavezokoke.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8a59c18b8---75778642716.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/46258989149.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16120b5bd5aba5---59678157192.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/lp52e4kj3vlkud8aj2f142a2v5/limekegagowonefegukewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=champion+gasket+sheet+price+list+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_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 11192 bytes
SHA-256: 4305c865373eb750b5daf5dadf1b978b98b8aefb5c3faf092cebc5742e08f1ae
font_01_sfnt_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B70 18592 bytes
SHA-256: 8bc5395accca785892b031fab38b74a322961d892dd820a54232fdf8d1ad0841