Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0350639ecacaaeb…

MALICIOUS

PDF

130.6 KB Created: 2021-09-20 19:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 806bce4f53be392bfa55d5619d17d406 SHA-1: b23024c7bdcbcaf17463eb8f5f7d9304cd999a8e SHA-256: a0350639ecacaaeb730b495b30825140c30c48bf1d80249ed281de95733b6d6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score further indicate malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://ooexperience.be/assets/Image/files/67455313614.pdf In PDF document text
    • http://atmaircenter.com/lb/userfiles/files/xuwigelawo.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/noxitasasixewi.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/kewifafomuromawerobikol.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133275963fff---36882295462.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/28635590887.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/tadojowegil.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duxumeka.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/16482075542.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/lelamavozibukupexi.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/gamudomudawugexuxisebe.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141117c5b940---fuzelul.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/sebize.pdfIn PDF document text
    • https://amgaa.org/temp/files/8054427967.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/72813605903.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/goritimewosomevokigugup.pdfIn PDF document text
    • https://polandpools.com/contents/files/66788475299.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/66383704121.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9c8bc1c5b---39417521679.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/35117101009.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/59019400949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+hammer+of+thor+pdf+downloadPDF 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_off000199ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199EE 19436 bytes
SHA-256: 43ebb510c328d5f04fa3e992662743dc14a4ea8f4855a70f21dff4a27f09f7e7
font_01_sfnt_off0001cc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E47C 10552 bytes
SHA-256: 2c00943e8c071a50513dc5f0ec220fea5e4a288f7c0a5c9a01c999df1d6899ad