Malicious PDF — malware analysis report

Static analysis result for SHA-256 237d50300def90c0…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 20:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bc65c633dde323206a71ea7ff5af8b5a SHA-1: 377ded5ba2da1bbbcbf0bfaecf5c396cbf04634c SHA-256: 237d50300def90c012b9798d094df37676f64e5788b23b741b91878308f384f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://irlanc.ru/uplcv?utm_term=the+art+of+case+study+research+pdf+download PDF link annotation
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/08184dbb409a7610f315f3e153b1ffd0/90747704340.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/92evpencp5gfs07o4rpa79sio7/45110733005.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6dbe6c6e4---57982468975.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/jitexi.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/10674143919.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/72248562265.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160794a3f315a9---fumaniwivazememuz.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/57707326681.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6aac4c2b4---65949551030.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/22469197299.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/dijibada.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d9fc025a9---wanatojigejavutefodiseba.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/834c5c2d9b1b14e8e22952ee8ddedf38/xejutoza.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bccd59fd9---9231797101.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/1c17d17c3f68718756c78f53b934051a/xidifobipozukuk.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/6ec5d8a6c12943089861d52f834f5a60/zojolavufefonezopuzejim.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/jozivixejibigutonivumafuv.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8aa60925e---96805725997.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/3b1020eb95f0fb637840b91938029d27/medesus.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_off0000d23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 17772 bytes
SHA-256: 3f6813ff57ac624af975a0ead8756b2c0c153ee9fc1675c559bd64c58c1d6ed1
font_02_sfnt_off0001189e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189E 10888 bytes
SHA-256: b03595ca38b59085c48c66fa638abe998f499f12b64bc1384ee964df2d72c121

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