Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf02063e3d142e64…

MALICIOUS

PDF

76.1 KB Created: 2021-08-28 08:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c7531cb141dd73e20458f8e8e1776ed SHA-1: f6faaa8b8a1bd8853f040fa0ad98160b1a9a5c15 SHA-256: bf02063e3d142e642829dda7295d2102eabb684d90cb98cd65d908dae608bcd4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm or SEO spamming operation. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple links to potentially malicious or compromised domains suggests an attempt to direct users to harmful content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b8e7c27b1---38234097593.pdf In PDF document text
    • http://naturalmis.com/userfiles/file/23340986046.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jazuwapanumukimulom.pdfIn PDF document text
    • http://allycatering.com/userfiles/64162652003.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc0efcb503---48492402835.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/sadedewogenivolitusok.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wafomegugarosusixojex.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094408415db1---25231625040.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/82543420833.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34f7cb86e4---22878862298.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/moxotax.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610aff232ef67---xexifumorezudinogevibixo.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/3d10f2b0e3d09dfa71b15bbaa7f64acf/zoxinekugeze.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098417fb2a9e---merupiviluruwomupagepoj.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aef5ab809c3---82578197122.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/mofelelijonikefunolunez.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/21641221627.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210813_193225.pdfIn PDF document text
    • http://e-menu.hu/editor_up/semenadowazakiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=right+sided+aortic+arch+ctPDF 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_off0000c56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56B 17360 bytes
SHA-256: e8508aad2ab3801ade592ba68c29f993c754b9646ef2ad2c5723312661f48642
font_01_sfnt_off0000f224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3B 10544 bytes
SHA-256: 3321dcc18ba5cb6b4efa8485bce6448acc1a3694ecf18ef40e230954c970d762