Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bbfd300d79cdd97…

MALICIOUS

PDF

64.0 KB Created: 2021-06-10 16:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9cd222cb98018b42ae36a910e807a98c SHA-1: d2c0218fa061626088906fed73b8b2de748aebd4 SHA-256: 5bbfd300d79cdd9742e3f19577fdb70668ac97ee8c1a4c059f5c29b1540747fc
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and other domains, likely intended to trick users into downloading an APK. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8971

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://krisoc.ru/uplcv?utm_term=thoptv+apk+download+37.0+apk PDF link annotation
    • https://hondamienbac.vn/userfiles/file/bipaz.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ea1fevdeovrrv1jr1706q8hefj/43121922941.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/bv8n3qf0inj09i1pq2vk91ca42/donuvomewebegusote.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160867592c9321---wikeboxasofesijivejadu.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/d636218b71295687c06fd57099667453/41295483229.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/de045fea2c65480eb91986ad9b07ff6b/22244894624.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f8b11f27---69804606986.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c99518d47---54894185375.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/32b31ade910b13d65946b439f3a76020/42921986297.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/q7cd64ughrursl2lft2sguoiaa/pasolaboseneniwakaku.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/figawakoxinugafitaz.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/83564820966.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/kiwivisovalubemone.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/moturulubitibuxigilan.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/debe1e2e8fac755fd1a6416616a018e0/8248294831.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_off0000f202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF202 5356 bytes
SHA-256: da924ff18fb4140b74be0d666a7308792970cae51ace2714b1e8ce7f771430e3

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