Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b587c818c846de…

MALICIOUS

PDF

40.6 KB Created: 2021-09-09 10:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 6c205373fba90fe73225646aad4196e2 SHA-1: cc3f2a9167ba60c7f977313b6974f7ae0f1c7557 SHA-256: e2b587c818c846dedd1c9665bc5eb402d2f3c3543cbcc839be054d7138149867
182 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, contains embedded JavaScript and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8574

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 40 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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://coretry.ru/uplcv?utm_term=pokemon+blaze+black+volt+white+download PDF link annotation
    • https://yenicekentkaplicasi.com/userfiles/file/nitiziwowuzezodutegibaz.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/62126496042.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/zudifakomaru.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/tigazajedej.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/falefopidupen.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/kifumuxutod.pdfIn PDF document text
    • https://designclarf.it/file/luxagimaxijafokub.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3513d15d50f85755ed1e731a59bd2f37/vatojokosu.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/wenaz.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/50830185131.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/c2edcdbceebf22e5e5c5c90184f910cb/21058306403.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/76753023216.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/5k82hvop4cbqn36j1joi97vgf4/26712995574.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7ea5ec887cf4a794a0f38c96beee4f15/sizutivi.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/7p6fbr6qssd76aeotcl0h84f3s/23139144531.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/20563719346.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/fobag.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/finonisesorewetibavuj.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/30799282707.pdfIn PDF document text
    • https://uudanbury.life/files/file/31704299255.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/83935159288.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090619085073499.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb2eb4570---20870946046.pdfIn PDF document text

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