Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd3e322eda37f41f…

MALICIOUS

PDF

93.9 KB Created: 2021-09-06 05:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f4c35bee4abd2a0ec876e1aacc8295bc SHA-1: 63154160d913d353e154cbd5caad074b8aeeff70 SHA-256: dd3e322eda37f41fe1278b80a39a9002a587c5195abd4db678511ec6219bb370
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://sakuragiramenandsushi.com/uploads/files/riravurat.pdf In PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/34174404758.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/zulibokogamenupi.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/ribelasok.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/0e66a65e1703054c42051be0e6a40879/zotagugu.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/fusabepamujomadazuzuraxu.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6208170be---batapafalujal.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/113240c06966581d8db85c6fd65cc34a/83015185923.pdfIn PDF document text
    • http://underbutter.cz/download/foto/xomobojopokula.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///nufaperarexek.pdfIn PDF document text
    • http://yljx.cn/images/upload/File/29906653829.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/a848q75qb954k1dtcu393s3em3/7425084795.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/92542097194.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/tixufixagape.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/c2c4289ff0af8709c9e8b59305c0d201/bikavoti.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/pajovejuzusidebukumixe.pdfIn PDF document text
    • https://ka-base.no/images_students/files/38206720713.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/01247ef7a137b4af07ccb73021013893/28591805783.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/nejozisupesedulaji.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/50510911474.pdfIn PDF document text
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/4954702223.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16079475d68d7d---53543959042.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a8cd60778---39682823150.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/22736564955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=celcus+tv+dled40125fhd+manualPDF 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_off000103e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 11132 bytes
SHA-256: 6f76b6d726de5d581a95adaf49d2d4dfaa9bead5ec703b7e6605cdf55cb64cf2
font_01_sfnt_off00011dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13600 19600 bytes
SHA-256: b5c81854b30d5ba2aa8de1c6493dfe58400b36bb09d0fd21b5a1e182cf36ae5f