Malicious PDF — malware analysis report

Static analysis result for SHA-256 50fac908eddad1a2…

MALICIOUS

PDF

88.1 KB Created: 2021-06-25 14:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e3071131e54fbaff5ee2e3b19cb3d597 SHA-1: eab5bd6d4091ed4c8f429a0fee0c83be8e415951 SHA-256: 50fac908eddad1a27473bc0cea9086aa143e83a1df644d04865a2717b83d0a67
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm or phishing lure. The presence of external URIs and the nature of the heuristics indicate the file is intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://manuscripthandler.com/userfiles/file/wotekibe.pdf In PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-31/20210531210129500531.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b7052c0d3---75835074672.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160863b494eb37---veriror.pdfIn PDF document text
    • http://mosjob.ru/images/file/94895539827.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202105241920298150.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d190f3c8f2---32333165319.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e671f9dc73---bumiguvejibowidir.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/0fb15c4e8b14c6f5b05ec5cf74b62422/raresep.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3225686e---32480572517.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf50f340724---86526608242.pdfIn PDF document text
    • http://altinay-law.com/images/file/dunezifinawododuxug.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/76593484560.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8fa6bc637---43969356516.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621245450.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cf946e654df---8762618307.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/defefoxusilizoxiwedanumo.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/15679787313.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/48462529204.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7daf85e35---69781217474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=games+better+than+milfy+cityPDF 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_off0000f419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 17820 bytes
SHA-256: 0157de1b96877e05f94eea756c2f9c373e179c1693f0903b71c98e780e70d2ef
font_01_sfnt_off00012286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12286 10772 bytes
SHA-256: c54ca7794f516f763dd6440575b711e60bb31518d6fd3b370ab038cf36db6e69
font_02_sfnt_off00013b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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