Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de66c529df29455…

MALICIOUS

PDF

91.6 KB Created: 2021-08-10 07:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1a2dadb14fa47cfd89011478ed113063 SHA-1: 78f8699035dbe7b62953f7b7bf3cc01ade77dc54 SHA-256: 6de66c529df2945585b91bcdfd1c8a6bed7a0fde49df0ff218d51cd1a90cd9d9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of a 'callback lure' heuristic further indicates a potential phishing or tech-support scam. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cructi.ru/uplcv?utm_term=class+10+science+light+reflection+and+refraction+notes+pdf+download PDF link annotation
    • http://phdpecs.hu/userfiles/files/javeletimilewabodi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607773a7bec57---2328959450.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/68c62f1f4ba3525b50787ebcd45ac1ec/zifaluguxoto.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bbcc5b77c15c8529755d94e07f8986cd/35298697955.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16085f6aa33f1f---nowirusunuz.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/65277142582.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/29069385886.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/vujerenigiz.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/maropazobarulevanupekawo.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/79841292549.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/fafotubimetajidi.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b013dda94ec---mozened.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/82ff1e9aada8441b383128106abb991a/35261767765.pdfIn PDF document text
    • http://strandedtattoo.com/file/21975246258.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ufsoc5rtao9uj1u0psoa9n5ah/mupitilazopinijepubumo.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160850176a458f---10896753994.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6b19b774d8ebfcd11b136479af5ca3a8/zusen.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fbeee2bd4---mizijujarapuduj.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/bd90376d9daa5a73b6080101d6803e21/fawemolokepize.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811b634863e---35444818124.pdfIn PDF document text
    • http://dejede.com/userfiles/file/47532172305.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090115fb0c6f---mupodugis.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607da0c17b350---23833838911.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/pivikediwapuzixa.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/nolixobufijesa.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_off0000fe02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE02 17804 bytes
SHA-256: b494907753dba98f7da9b2ecf9d29455300aa8598edcebb70b70c6fcd9dc4695
font_01_sfnt_off00012caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C6 11188 bytes
SHA-256: 967aa2ddde9ef20a904c8d4fac7e4b9191247a85281e6f2bfd215c9131b104ce

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