Malicious PDF — malware analysis report

Static analysis result for SHA-256 65585b06353b4b4b…

MALICIOUS

PDF

77.7 KB Created: 2021-09-21 13:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3cfa99746ec47754e182288dabd4158f SHA-1: 7f45c60de86431f6eba47df658d55921ffee8573 SHA-256: 65585b06353b4b4bb361c0fe4c5092c58f01a4277dec4a0be498437df1b8a6b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, and are presented with search engine optimization terms like 'crack'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs and link farm structure are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://oniceh.ru/uplcv?utm_term=cs3+serial+number+crack PDF link annotation
    • http://kowel.com/ckfinder/userfiles/files/1630749594.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/mituradebogadi.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/61420135921.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/77106481985.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/zukuki.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/mokowesuwadukug.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/kukarimenigilu.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/e038051c1384a8fbc7f9723f3d8d862b/gumixoz.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/30078794661.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/gupuzat.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/nagasilodipa.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/54265405790.pdfIn PDF document text
    • http://babamoleskine.com/files/file/pasedekajeninepelewede.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/79548444788.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/57954393933.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/22962107870.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149964776945---75216473855.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/v59t1escanm2olq0ss9hoat01p/10181066825.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/985744f85bed9cccb7bfdc7acfa90bfc/nujipawala.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/90441922954.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fde938871b---62967735382.pdfIn PDF document text
    • https://norservis.cz/files/files/25832984058.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/pelimugepidipiporimug.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/82909038880.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_off0000cdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAF 16768 bytes
SHA-256: 49941d476dc80b5b66a8b351006523345c37920d5b3e3fa5ccfe59ee982868da
font_01_sfnt_off0000f903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001111a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111A 10708 bytes
SHA-256: 0c7c39673413a6755d602976dddbfe0f9d4d8df1aec271cdf73eaca4842d6751

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