Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c50f4b8b7b4e01…

MALICIOUS

PDF

72.5 KB Created: 2021-09-20 07:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 632b5c3c7e22f3ee6e8edc1dcbc2be29 SHA-1: 4c5299015760b76a6f9a7e038d118c6b026c12da SHA-256: b3c50f4b8b7b4e01ee5c8d36ae035939ce7c01b0a41a4d56adbe475997820e88
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of a phishing campaign aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/fn4mdfmn8mi5d8pg48tc4mhibu/23156434510.pdf In PDF document text
    • http://praxis-greve-polley.de/web/editor/files/56419059945.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/39164608740.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/79384887301.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/87689425440.pdfIn PDF document text
    • http://myphamasia.net/upload/files/xoralobirofuzawij.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/wuwidojo.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/wuribelobowaguzabeto.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/23505346929.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/gamudigifizawe.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f401baf6d---rimasuguzazirezipomakupe.pdfIn PDF document text
    • https://digireg.org/upload/22100925244.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/juxubisuguva.pdfIn PDF document text
    • http://smirna.pl/files/file/tidinone.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/48157777455.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/6146ab3ee9c8b.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/4103331521.pdfIn PDF document text
    • http://adveotec.com/img/file/59599966807.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/94962247541.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/8275e8de8912acf0c5cfd1e911dbfd3f/pedot.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/51534296672.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/46028996650.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/49920592030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=como+armar+una+pc+desde+cero+paso+a+paso+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD308 10676 bytes
SHA-256: 28c9695ce163f6968c37bdcab2332bfd110de8046a11539f859fb61a7ef07e70
font_02_sfnt_off0000eb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7D 16408 bytes
SHA-256: 749677a29039ed1eb0744ffae67ea9bfb4b3dad0533b092964ae34565a93a8fc