Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ebbcb5d06279a89…

MALICIOUS

PDF

72.1 KB Created: 2021-09-01 23:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c48d9c997ae1f04352d7527bd8ee80e5 SHA-1: a493e76b694e1907ddd911c2011d96959494b8b5 SHA-256: 7ebbcb5d06279a89874c6f53763fb9cc56d666dcf32f1f576317c75a53047858
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://wastran.ru/uplcv?utm_term=top+us+reits PDF link annotation
    • http://yameitecl.com/ckfinder/userfiles/files/20210804_215632.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e1b7b5351---25368046266.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/8aced0ce45d4b5f74021448ee0316dda/56860420479.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/50054755908.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abd4b7d7c70---rodumozibejoxatoroliwexed.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/jivivaw.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cc22cf98f---kemuninud.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/zuxufileti.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/8t80mrvi21cjksrb9b61th6n1m/51823319551.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/28769628186.pdfIn PDF document text
    • http://net-marketing.hu/images/files/jawapalazekasagixodalizil.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d4d2d71a1---nofiwivawamovotenukixal.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16112429686693---lenexen.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/gokupusetiwujal.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7e14379c5---69408632425.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/70865784178.pdfIn PDF document text
    • http://sous-mama.org/userfiles/file/96644373238.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106101614.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/milavafub.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a5e215a05---vemilegebiberemafiburub.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/mq5v2uhm6vdlgk3tea3dd3s7ab/wudoneze.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_off0000b8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D8 9996 bytes
SHA-256: b7c75b542d7d85fb8cef5671198c55904180a76e1c4c1aff78079f4560fa7624
font_01_sfnt_off0000cf2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 17288 bytes
SHA-256: 7ebc7878b66e051f8ad4a685b8c771dac1307fdbf85113e22b6b2c38de1ee1e4

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