Malicious PDF — malware analysis report

Static analysis result for SHA-256 49fc8972578458b7…

MALICIOUS

PDF

79.2 KB Created: 2021-06-12 13:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e037dd5fa7adc5eb101cbb0c6c0fbc00 SHA-1: 8be4b09455ef0a021e370d4c41576caadefa3e21 SHA-256: 49fc8972578458b7b88716c524c74ab5ca0d07734a3022c7275ae3bf1cf805b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm designed to trick users into downloading a fake "Windows 10 edition free download". The links point to compromised WordPress sites, indicating a phishing or malware distribution attempt. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://drafthe.ru/uplcv?utm_term=windows+10+edition+free+download PDF link annotation
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c963e7f051---48477986484.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/3c65a8addd06f541b1633f275eb7f79d/vonevoweletibub.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/d87709539a5617f5c8aa1e115d424614/gasunavep.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/68406825086.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d42ba6419---wugilosaraferologane.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/32473050742.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/39830447139.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/bcatle1bcksuaq4tcndqfhji7r/zukezinekenovirudik.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/25491918136.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/pisis.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/1e9496d96229c56771c978a60d58b4b2/vamosubonuwur.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/72477810280.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/wiwuvata.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/pomigitekezi.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/kqgem313nt6bpl6e6bgtusfath/14107957992.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/526a728e32038531c74be00b1764f88c/wekowiresorike.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b91d12df6---wuzelusa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 4988 bytes
SHA-256: bbf3b141d5011b3a9abf7ad224f38349d3ca001a4d049702df251ed3ee22ea8f
font_01_sfnt_off0000fed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED2 10192 bytes
SHA-256: fcdf382c53249ae05550a5bf295cab0b88321cd215ece1f86c68580e23e5591c
font_02_sfnt_off00012169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12169 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361