Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f86f73d6c90a44…

MALICIOUS

PDF

70.9 KB Created: 2021-09-05 21:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 25a72034043c01bea3396e7a4d6b4f8b SHA-1: bd97d28dcc1d2e6a55a1b65269f3b6e8df05bb18 SHA-256: d6f86f73d6c90a44999dd1c260297320c16fa1670b9ff4ea7d6f6d2515a2e943
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further payloads. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=project+management+risk+register+pdf PDF link annotation
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/86d126026266da09f9fa65dd9e295dcc/19007882174.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/73421330437.pdfIn PDF document text
    • http://tms-operation.com/upload/files/lideselo.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/71277518828.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/5829913469.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210803101902_lx1tf9.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/juvotelabelebunodi.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210718_020244.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/41823347334.pdfIn PDF document text
    • http://dentherapia.hu/files/file/19400602043.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/26bj9uko09aa92bc459oip5cu4/sijawolaziferi.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/kafodanapiwulezukoxuw.pdfIn PDF document text
    • http://mcutech.net/upload/2021/08/file/1628269123706031321.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/f88436a23f517a3ebab58db50b2dd637/50396142590.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/3873155386.pdfIn PDF document text
    • https://landbar.com/upload/files/45583158882.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/lametaxejugepo.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/40232620934.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/zujatazepeb.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080b336e09eb---13497422291.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba952952277---48443177576.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a03e37c2cd8---3274166240.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/2e830504q6fe9livausogfi3t1/77855017785.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/zuvebegamub.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_off0000b6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B9 11140 bytes
SHA-256: 4eac1d17a369ba7e2e45f853c0bdf9e089c69659c8e31a7adf485c59143911b7
font_01_sfnt_off0000d086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD086 14976 bytes
SHA-256: e7c482e2bd3d89e0d8d53cac163dca16eb2470a3e2c7d7da9751eb694919910f
font_02_sfnt_off0000f644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1