Malicious PDF — malware analysis report

Static analysis result for SHA-256 63bba10a36e8dd66…

MALICIOUS

PDF

93.0 KB Created: 2021-08-11 00:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aba8f6a13594937e7e642b65f483cbea SHA-1: 3073aa1e32778a230c3f63a0773dff1793863e3e SHA-256: 63bba10a36e8dd660af5ab289140eaa0d4067e49edd8058aa47ae92bbf47d5a8
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://alpha-cp.com/userfiles/file/paronuvejurefo.pdf In PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870c9f75e74---dejevogutalu.pdfIn PDF document text
    • http://bienbao.net/uploads/files/76714299409.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b21cb6c28---51968768679.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mubudusitidavuletopapoge.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/belifuxoxodagibubapej.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/pimoveku.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/fexaje.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/jh7ve56b7ltfsb5iuskl926uj1/11152170047.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17c382b764---nanonerude.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b89147ccab---29015651436.pdfIn PDF document text
    • http://sushi-belovo.ru/files/77892677062.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/lebasijol.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/gilipudojadoxakadopefepe.pdfIn PDF document text
    • http://usmleworkout.com/files/file/96881527119.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/75699866540.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/29119323515.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/67967706725.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/notarasudijosokazup.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/lasowixiwaxevefetu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912c80e0c03---femoxesemedotulezupolina.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e326736025---42194882771.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/denem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ocenaudio+user+guide+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_off0001006e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006E 10776 bytes
SHA-256: 46c9801269299c4200552a0dfcf921e386fe429cff624a2c0bd8c421211308a1
font_01_sfnt_off00011920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11920 21216 bytes
SHA-256: 2337f09d3391f341342dba3066daf50477621cc08baf494a64cf8ebdf86d9506
font_02_sfnt_off00014dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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