Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a5e0e4d82e8bb6…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 12:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b25a761c380b2fea061133f752967ae SHA-1: 389d32682e6f42192a89e84b546952efa022ba6c SHA-256: 75a5e0e4d82e8bb6d29ee0ace1c2f6dc47b3f5a811c925c04439992fdf809cc1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm used for SEO manipulation or to host phishing content. The presence of these links and the overall structure strongly suggest a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=ar+rahman+surah+in+english+pdf PDF link annotation
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2106cf2b3---xapegefodedij.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/86db84047131246f03bc94fc7ed9fc84/32693969450.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/xutenetapububema.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/75544844057.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/87126874382.pdfIn PDF document text
    • http://dsrental.com/userData/board/file/27860296463.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/jekiwupebakixuwi.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/13443721844.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/492d3ec23fb80d71eb94dbe5073f833d/99958147715.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/goripupedemopakilad.pdfIn PDF document text
    • https://estoniapools.com/contents/files/62200426621.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-28/20210628133334593642.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/nevar.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/lurususebapaj.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/buzuniwegikiwomexu.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/60719414500.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/bekikigefoxululunisaze.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/2662381775.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/33236598174.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c062b6eab3d---posazonuku.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/muvebefubez.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ce2b574debacba2134ebf8e90ea607b6/numuxenidege.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/83404040177.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/39083782330.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/geregajemerolak.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_off0000db6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF384 10808 bytes
SHA-256: 0cc3a56c2cc758cfdeac0a295875467714aebd6dd4d10a7891ea6892bdbe1515
font_02_sfnt_off00010bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF2 18832 bytes
SHA-256: 01ec9abfbf371da7c961f821eedb7f87aae281d506e5927538565056bdc0059f

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