Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c237913833af8d…

MALICIOUS

PDF

85.0 KB Created: 2021-09-23 23:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 916b4c9f8b391fdac79f45188ca23d07 SHA-1: 3b8a417454698a07147ae2daa3da9d31fb71767d SHA-256: 07c237913833af8d34ebf4a7473dcce66616384de1b65411eaec3d7edc60f595
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on such sites, suggesting an attempt to drive traffic to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://congnghiepxd204.vn/upload/files/negijozav.pdf In PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/40295430999.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/fetopokifavoz.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/i2n47r33gdr99t0fd89m4e9oi5/3514269633.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/26531225361.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/wilutikani.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210918105341.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/41842178013.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/fuvanomafumixada.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/15430759947.pdfIn PDF document text
    • http://checopharma.com/upload/files/514474339.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/50461669704.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/sixofemepumetiga.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/88832001325.pdfIn PDF document text
    • https://ms01bet.com/contents/files/mikexobe.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/36756875098.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145561433d5a---luxonudefuvis.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/68108374259.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/18329485192.pdfIn PDF document text
    • http://belniig.by/public/file/sugumatofakusuvo.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403a963e648---sataw.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/50454737760.pdfIn PDF document text
    • http://eko-uklid.com/files/file/kenuralemipozivam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=who+developed+android+softwarePDF 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_off0000e7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEB 17712 bytes
SHA-256: 9627053c4cbb98d1a291b34ee84799ad60d100aa14276c98f26401803e5f4978
font_02_sfnt_off00012da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA4 10740 bytes
SHA-256: d5706c1098767d3e46de733d03ee88b4b4e7458b2a1be869671bec7a49c25990

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