Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07171bdb4eddf8a…

MALICIOUS

PDF

75.7 KB Created: 2021-09-07 18:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ec77e94836d2d380a6d2bf9553523ab2 SHA-1: 89820ca2e16ac49218e86699c2f77d75783205f2 SHA-256: a07171bdb4eddf8ad7a70cdef2202e041e054f506aceee609e083fcc8437199b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites. These links likely serve as a link farm to redirect users to malicious content or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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=excursion+definition+pdf PDF link annotation
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c1dfb4bfa913f8908874bf8180db2dff/81879002821.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/5797529340ccff7bd6ca78f61c4f6b4a/wijatimelaf.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1626627761.pdfIn PDF document text
    • http://aweibel.com/Photo/file/desuso.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210727192834.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/siroziragipa.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093372eefb7e---69048466362.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16096455a9d4e0---guzigotujopezo.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/wiwine.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/kunaturegoja.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/60109482217.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/6f5c4lrn9ammd3somtdh2rqvq7/velividazodudural.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad3e06d8f---toxeguxonapininifex.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/72630961543.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081826841011---venawedupirosazemima.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/xezafeg.pdfIn PDF document text
    • http://cuacuondaiphuc.com/upload/files/21751213383.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/c2hjm7l96guas8ovvg2j7foc57/lekedili.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/84659879844.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec5211b10ca---45400839574.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/a824a692c146a36028604636398a3486/loxuwusokomuxel.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/bujanaderiwudodeka.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823d31116e1---75495865962.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/56345119701.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbe2b255f7---76139654076.pdfIn PDF document text
    • http://usa-ex.com/xarolevimepufifexewiwamok.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_off0000bff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF8 19120 bytes
SHA-256: 227032270a3139ed403bbcceb2ea146cc0af37e00ffd5b14494441bdc9c6ca78
font_01_sfnt_off0000f0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F1 10592 bytes
SHA-256: 00056200a1efe7472fe431202c3633c0ff9523b42a547596755f20158f5699d0
font_02_sfnt_off00010942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1