Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b402933433e397…

MALICIOUS

PDF

88.5 KB Created: 2021-09-05 09:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 201bcc3b0e52a48c449df3eddba27cae SHA-1: d8b6186a31d6172e78b6eefe897eb35a6c2880af SHA-256: c7b402933433e3970e580b0065147b32e7a988b80643057ab1bf39589c62c319
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the 'link farm' heuristics suggest the primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://ketchas.ru/uplcv?utm_term=anthropology+and+ethnography+pdf PDF link annotation
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/14c7a87c2cdb2945261e7c6c7c22cd62/suxegivozinaxisanudijovup.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04c785f18d---36300824315.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/dejonojofawazapitub.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/er1mu16l46mjhs3gu0c3f12r81/18318580905.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/97249601589.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/zujovuvilujug.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/milusenubenitoj.pdfIn PDF document text
    • https://path.mn/userfiles/files/26388065686.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f94c7455a13---gesatajasib.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/8e141fe8a314db201c4c4370cd2408fe/jepudigekuget.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/47924620809.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/labede.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/95992882368.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/55659196362.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/kapelo.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/jotabaradosadokadumubob.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/a444877490b5ae1726c300a76d24b662/movosoviwowetatate.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/rodiratas.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/nalujitinuz.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13342410698.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/rupinolipukege.pdfIn PDF document text
    • http://fxmeat.com/upload/file/db4c0a377df54fb28887f84d37bbe236.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083b9b6ec179---rokafudezovarovago.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_off0000f733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 10612 bytes
SHA-256: 7cc439723f726eb580e2939f0ea88965bd4788092d7bad33414995d7762c08e3
font_01_sfnt_off00010f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12750 17580 bytes
SHA-256: e0eaed7f997d5fd61352f2627e61c67442c6081dae8adc6f5c2c0df9e14ce4eb

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