Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f85fcb58a5b1e3e…

MALICIOUS

PDF

65.2 KB Created: 2021-06-13 09:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 06334c008a066087e87afc6dad94c766 SHA-1: c43b4a6cdd686774d55f15cc528233204df65ea5 SHA-256: 5f85fcb58a5b1e3e8744e24f48f02c9f678b09c4f11fee6b13c8cf16ba398bd5
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body's reference to "Clash of Clans th10 farming" is likely a lure to entice users to click on these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9736

Heuristics 5

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=clash+of+clans+th10+farming PDF link annotation
    • https://zanhotel.ro/beficientconsultingFiles/file/rijefotijojaxikafinenuje.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd72371c93b---porutamudaker.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1621204583.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/saripojujomazukapolupufil.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/3f6479d17251ccdc6d89df72bd55fe95/vafuzujafufipis.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/af7476d7ceca3389be8b1d3e61232437/67543695070.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-5/20210505105050818274.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e35566341bd5a4de168fc07913a35387/sakav.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/70480940504.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/9og2t8ctelbo735b6iuogv0oq6/57219040270.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/5tn57qdo7e3gm4s6eqq9tmno9j/guworesag.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/v11i8qo762pi0cg0n0n5dnjfp8/75723811699.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/7994d39cd4b02a849cc611c2f9d8048b/81568353665.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160afcbda2ce7b---14418339307.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa473744ac9---tizedejejipakof.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/27260554507.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5B 5396 bytes
SHA-256: cd339c66ffed3073f347122ac34163e3a35fa2f2d2b2ac157f4ad2ba973666c3

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