Malicious PDF — malware analysis report

Static analysis result for SHA-256 0abeadf8fdec551e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 22:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 066627436626a7113d6a405358b8e62d SHA-1: 71f567c151b1160fe4b6e7df38cc88e380478924 SHA-256: 0abeadf8fdec551e05dc0a97a402ca9f4717a661d55323265a2a81e4b971d71e
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites, suggesting an attempt to manipulate search engine rankings or redirect users to malicious content. The PDF structure and embedded links are indicative of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=ipl+time+table+2019+pdf PDF link annotation
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608867143db2d---50434304433.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160703f8a1119e---dadovofujipigurojogezi.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/wafodixofuzam.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/mezopujabedela.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/dd00f73e268515addc2ba6c944d236b0/94151421162.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c455ba811---ramewopitimav.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/89226384912.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/pozatel.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/68082215764.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/408a27dce4b871ed67c5370cef09001d/zunijujamivigefaj.pdfIn PDF document text
    • https://olterus.org/contents/files/8800919978.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610137183dfdd---77287507562.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ad04a9e51b5---6166871794.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b0844aef8---tutipunilujepimot.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/88191930260.pdfIn PDF document text
    • http://chieucoingason.vn/files/wuwomej.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/58121606380.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/52132656363.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611687a864c3c---nidufafisukukinuvanefo.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/3f6567f07af91d7bc21cd3f64f1cba9d/60608257070.pdfIn PDF document text
    • http://bgindus.com/t/tutorfirm/uploads/ck/files/24922793967.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4d9038f4cbe5ac9a5c47739966a82c92/pufakeru.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/mifisegilenu.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086b5ed6b9d6---lorulinaro.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_off0000dc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4D 10720 bytes
SHA-256: 1116d9d289c7642e96831880f9476213cae44eff6eabfc95a19ac2f9a9491553
font_01_sfnt_off0000f4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 16948 bytes
SHA-256: cab6ea29a1f6cb9bb9a561edc3a4b4f88fa87ef6fa64f4a0741389ae2e9c5ad2
font_02_sfnt_off000120ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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