Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4fea01e69dff0d4…

MALICIOUS

PDF

76.8 KB Created: 2021-09-01 23:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 40bb37eb7b79e6ed8f68f4746717eebb SHA-1: b976448df78ef5345819177fa100507026f9eb1d SHA-256: b4fea01e69dff0d4b0865a2f45c7e4da3a14c5abeda5a5845fddc530b4cc22ea
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, many of which host other PDF files. This behavior is indicative of a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://catamma.ru/uplcv?utm_term=polynomial+class+10+important+questions+with+solutions PDF link annotation
    • http://ecovn.vn/uploads/news_file/reravotixewumuvo.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087492600f1c---lixared.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/desixuboseju.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/wimesipezodazilej.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/46968227507.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c0f0b1728---tozazewapuw.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/87450365009.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/90lbilk8i20fand0j1btervlkf/65354876026.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/200219303960.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767c4ff0c4e---sagidesixat.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160757476cb8b5---39072743896.pdfIn PDF document text
    • http://ipublicity.cz/data/file/55827912348.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de15b4b4c8e---zudiroxonuv.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-8/20210808091641818874.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/dopumejepipotegojipivoko.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/47807527651.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/5158835751.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/c8f002f28cc7877cccd8df18de7cbba4/taxexotiwemiwotaditasi.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/rudabirilotilak.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/sosafinilavixaxuri.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95a7da7a0d---wisasitije.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_off0000c458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6F 11260 bytes
SHA-256: ba3ca22097ba1b39ab59bf221c409b193a3ed3af3fb704176c0236e34d44df37
font_02_sfnt_off0000f6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CF 17388 bytes
SHA-256: 9ad3aa9079bd867105a15aa6278477f69e376b9f501ff6eab77d30239d8a2c46

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