Malicious PDF — malware analysis report

Static analysis result for SHA-256 45251ab40d80f166…

MALICIOUS

PDF

98.4 KB Created: 2021-08-12 10:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e56fb107a88621a67961a721c81b3795 SHA-1: 51d790bdb08da056d23aedfc4f96f8210ad05768 SHA-256: 45251ab40d80f16682d8bfd5a4b5fbcf6beeea50381c0db9c610039448b17092
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bestwaynepaltrek.com/ckfinder/userfiles/files/87902647059.pdf In PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c53d11870a---niwan.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/jolevizig.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/piwemuwofizewuxapig.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/jisapeketarov.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/1de7696566b60a9832995b0a00a2c69e/texaxekikuzudimo.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/towafafumuzokino.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/e5e97325c194ce0be40f24402a4e9104/67835218160.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac9390af59---kejok.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/nutebofubutavemusub.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/b9515d4ffdad0df75c0b1da1591c2263/74105570441.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8b61e9b2563d4ac887870e4342bb0fd/gadovafufefof.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/71568693560.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/56vfe1psmanep41vf459j1v445/11526222155.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/27006584847.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/jdljm7c37ncd7oq9bbu432i9b6/63178579889.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca8a6272d03---fejaxivepebomo.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b1c10cb1b---40494201349.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/domafadoreluremefevaxe.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/zekaromaximagaxironivufu.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16088824800f45---fasavemulubug.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/lua84aeaj75mgncdijrj61c21t/39994882009.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/lokamirafavuloni.pdfIn PDF document text
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/2cbd5d2f06e80d7eae3eb34f25f43a4e/79357122313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=walkthrough+zelda+breath+of+the+wild+divine+beast+vah+rutaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11414 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2B 11172 bytes
SHA-256: 68c858a527b28632b99b6114eda29c4f347847aa68e6a6fa147be8295ce73e30
font_02_sfnt_off0001461e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1461E 1696 bytes
SHA-256: 28c5bcedffb0f63c0f18ed07264126f7c833899b916de9a351f9850be7cb6bae
font_03_sfnt_off00014e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E2A 16808 bytes
SHA-256: 539d1230888e54d55f39deff59c98572f6cbaf403486fae6001e5f954f584040

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