Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf6f8b84e5e4a92…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 14:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d612b32428ffeb255aa0effb02ac7fed SHA-1: 483e0cbcbbce452ef83bd51089aad9a51cb09ff4 SHA-256: eaf6f8b84e5e4a92040a83e22afff886852195ad6168445ff50fd72cafc15add
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, many of which are hosted on disposable domains or use common CMS vulnerabilities. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to these external sites via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://ijtm.in/userfiles/file/ramezojukeju.pdf In PDF document text
    • https://open-call.fr/uploaded/files/93489290051.pdfIn PDF document text
    • https://selltoob.in/ci/userfiles/files/22298594387.pdfIn PDF document text
    • http://foodchemsino.com/d/files/94433272709.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/9s5o91s180l3i75tca76hu829b/88545986572.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/68466188128.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/46067663b8fc2b6d8629996e85479cc5/wumewepotutikiref.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/50078187054.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/tuber.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/26135391563.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/43045206277.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/e28ee5e3f9e08c7176569e2d20162f4c/76019867060.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e067cef1c---bumutufi.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730447407fb---3620229688.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/fufozekevi.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/3557b22b1a96981a397c8ce23d103b47/47883870866.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/55612913739.pdfIn PDF document text
    • https://plasy.com/uploads/file/fivesikemeluta.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/89bbabe56b1456f17f8205bc8227b718/laxojopitipesikurenumeno.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///95089827886.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085cb06d89d3---madorigunuvenatiribiz.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210525182755_u98i2m.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/zuvabutof.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/verinu.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/e8dcdfdfa491f634e4636b273d847504/83671504720.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7fc12d129---sitimilamem.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a217cb97cb2---sivef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=present+simple+vs+present+continuous+test+intermediate+pdfPDF 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_off0000d869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD869 17912 bytes
SHA-256: 850594e1a4270552aa692c9d6414142bf9c7556740b74c0271279a2b875e78d2
font_01_sfnt_off00010683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10683 10948 bytes
SHA-256: 8a7f7c9ecd7f7f01ee5c7ea7873c88fda0b015f0b02f0caa30254b75229fd134
font_02_sfnt_off00011ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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