Malicious PDF — malware analysis report

Static analysis result for SHA-256 2964e2c7fa2267fd…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 04:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 66c6fa3c30d4b0f696dd3e31e17816aa SHA-1: d1c4a37e0d4f49c9a056cd4c49ab5b16f18dc14d SHA-256: 2964e2c7fa2267fde5c83cdc79bf10a2b18f3221f9d19f27c9e18045e6534337
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/f85d6772556fbf914bf2c59b39981d7d/majelemof.pdf In PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/2g6ojbek5mhua1biohdlrv5lh5/2940449184.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ae47b7da4---70616933822.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/rezovejulefabibusanez.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b69eeed52db---wapakejo.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/vives.pdfIn PDF document text
    • http://1970lions.com/clients/5/57/57eb30a5877ba0c7834658d164206012/File/zofurelagujesevevugovamo.pdfIn PDF document text
    • http://riviera.az/userfiles/file/15460832289.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/51013489099.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/499ee7b1b8972c7e6aece88477630942/dodozodurulafufevet.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/56572920779.pdfIn PDF document text
    • http://watch62.ru/files/files/gikusuzeveziragenefivefu.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/47t2aaa2pn5q7nhmevhs7i36c4/99426086229.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68a6ce6eb6---kibunapanesopininonalewan.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607747032ce9a---sijexuzabivi.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/26789161038.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/lukepimufubop.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/45678031191.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/37832238292.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/24075315490.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///85131196052.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/81072489622.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/vekadazimoke.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/83945220393.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/6cjr0ucmcruigfvcc5l3ng5k88/jorog.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/94688469042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ieee+paper+on+augmented+reality+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_off0000d9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CD 18336 bytes
SHA-256: afc7badb8fe4c597c3613573d760e56ff5610ae5762eeb7c9126fbc5740210c1
font_01_sfnt_off000109b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B1 10840 bytes
SHA-256: 63132504c85a429e64b78cf35225af493ef496feb7c5f773308182df5da379b9
font_02_sfnt_off00012278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12278 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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