Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6f5c71e36c1218…

MALICIOUS

PDF

39.0 KB Created: 2021-09-06 15:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 63631a71924bb5f1b49d0c56f0a56540 SHA-1: 11168209a261709b209739c3e198601650a5072e SHA-256: ef6f5c71e36c1218ae9a80fd6e2fc01121fbc89fd430b6e2ade8a74027ff86e4
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 0.8579

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 39 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 http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf39caa5fa---26428916023.pdf In PDF document text
    • https://asiarsolutions.com/userfiles/file/jagodanibanikiwinudavi.pdfIn PDF document text
    • http://valeneighbors.com/userimages/jomevinadowevagawuju.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16164ac206---wejiganojekotufonawa.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/kibemoza.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/17991835835.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e2268362352b7baed6378c3033331e62/fedurinew.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/3f1bc5bdc6ebdbea1044091550fe7f5c/70275923969.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4736ed9d6---jurugegapuduxutonevovovu.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-19/20210519204534218808.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cef0506d0e---bezulekutazuz.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/figidifalalasubemuju.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ba9367a0fe60f5f3e129a0002032252/19235613371.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109060557359088.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/61908289745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=elements+of+strategic+management+process+pdfPDF link annotation

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