Malicious PDF — malware analysis report

Static analysis result for SHA-256 9169bb69ba6172f7…

MALICIOUS

PDF

72.0 KB Created: 2021-04-30 17:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 12ba4bbd22ff59c3d1937ea85cfa1ac8 SHA-1: a4e68c5adee3d32feb7cf1212a9007cc6c5d2752 SHA-256: 9169bb69ba6172f7d7d991f583268d1bc31276745ee52c2cf7439fc347f97b5f
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to distribute malicious content or phish for credentials. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10296018f---tabubitozipixogugoleverit.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/fc492f1bb7e86955012792f1167fbd94/96767032170.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc3a00abb---tirunupolefot.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/emufi8ge9vshqresaqib4m8gl6/35570552223.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5707ad3ca---63010388836.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/8bd1ab7af720e4c56c16ea4d971a1eb5/rokexadix.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/22e5a62cc5d48e4e188f8fb6e9465e94/vuzufise.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/fdlhu6tig176m2bg49plbmls5a/molafuxegopamutora.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/81d8540dfe95ad246ad0ca6cdf2e1d66/96751071395.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/75b79012fa5a506f1759e75ef2d6f780/newusesodegofila.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/6a5d5c318811b77aa475a9fdaccd7528/dopudegalisopisipotuga.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/pqtaha8jhaerotsapi7r1pr13o/kudolazuru.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/pou92d285nud5ngqhj201kooo9/51912720434.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160762f279c808---57100542286.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/fbe1f3ae5d904f1784d1de6ba9e1d816/gupigodisagux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=is+benadryl+habit+forming+for+sleepPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 5636 bytes
SHA-256: aefae555270865f2e95bc67f4852f8bfceab25bf7af56d26dce24a0dce23ee7b
font_01_sfnt_off0000ed75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED75 10616 bytes
SHA-256: 5006394757f461d28e38aaa1dc9a5386d53f60b32122746ed3e0c7f75477369b