Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e36d6232d01d87a…

MALICIOUS

PDF

93.3 KB Created: 2021-06-29 08:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4308ee94fd0b939191bbf38357326b94 SHA-1: 9fcb3a2acf612aa2ab9fe728005886fdf5ef1399 SHA-256: 5e36d6232d01d87ae356b326504c23f7ed0f84b659fbb1fc0b1af878cc38796c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://medvor.ru/uplcv?utm_term=different+types+of+non+probability+sampling PDF link annotation
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/199le30ooo5pjt37bj90pia920/35154438302.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/jubowav.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210528/file/16221381037836.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b433a7e2ba1---nodawigelafudutovisiguk.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/desamunagegevus.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088196a8efef---99530532903.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/71205652743.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608338ba77839---53367618224.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4bf475ea0---xinofaje.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c978a35731---83607751930.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/dokolelor.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084267d7d8ec---nugipukos.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97af92ebbb---7650304505.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/44459202949.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160916e9e88f56---64184267926.pdfIn PDF document text
    • http://irths.com/upload_files/files/vaginarudorudoguwemibu.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e0e3b13a9---85557979040.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5ebcd309c---86647673636.pdfIn PDF document text
    • http://mahkotacare.com/tmr/userfiles/files/85528372485.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9649d4b2cc---rapotudasavewodidomozuma.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160854ecb014c5---15006310108.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/oa9qkd236f5l42sn63mo8ia6i1/39738492319.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/babedirafivi.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/13446740003.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_off000109d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D4 10956 bytes
SHA-256: 0cfb781470874ed83c5edf5c3063f14b90a7976fd59ff635eeef38acfa7b8d7c
font_01_sfnt_off0001230a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230A 17408 bytes
SHA-256: 10a953440278de792ce1abc6bdf4dceeaa7b166cc7513d4cad10202405a7ab19
font_02_sfnt_off00014fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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