Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4392bb11630daaa…

MALICIOUS

PDF

42.1 KB Created: 2021-06-24 01:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d90b798512f4125c45b1f5d707b6b8d7 SHA-1: e96729739dbda46ba16319bb871f9e7c31c71c4e SHA-256: c4392bb11630daaa83c9d8308f956663e3e2b9a3710bd177a7b804cba0ab5e6a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document uses an image-based lure, disguised as an installation manual, to trick users into clicking malicious links. The embedded JavaScript and numerous links to potentially compromised WordPress sites suggest an attempt to download further malicious content or redirect users to phishing pages. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8113

Heuristics 7

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 42 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cf8acc596---49930570615.pdf In PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c542ff6c877---68983124528.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/b9d2fcefb84bc3201797b17700c66f2a/62889221325.pdfIn PDF document text
    • http://maihome.hu/admin1/file/mudolagozafaru.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/vatozadege.pdfPDF link annotation
    • http://apexibd.com/uploads/fck_uploads/file/2132531312.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a354897784a---93247708202.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/dd4f8df2d8819e963a63bb5c529bfdc7/28769091222.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9a5e8cb3a71aacb1ba7a8e3ef777fb8a/tofaledijizafojaridamojav.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/varisulud.pdfIn PDF document text
    • http://runo34.ru/attachments/file/1956209472.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/c2cbc0183e73afc52d6a0a6fe0990255/merew.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/78785e14c9aa547c8ad31cdaec0253ff/vopatowikuj.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c465b0609---faxateviliritegax.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fe8743bd0---97910469969.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/5m08138hkt8rdkcm0fitld1ni0/69459549733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=daikin+monobloc+installation+manualPDF link annotation

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