Malicious PDF — malware analysis report

Static analysis result for SHA-256 0542a4684cd7e6ee…

MALICIOUS

PDF

78.2 KB Created: 2021-09-12 01:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1dcd7f40f287994ee80f5eabcc41b77d SHA-1: ddbd11f3f85586c2ed806f86d86365947ac6a317 SHA-256: 0542a4684cd7e6eef613a5553a83ecb343ca63cd69992699f82501b1f52c9883
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0a0be107a---nudalamotixan.pdf In PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5408baf7c---86136888250.pdfIn PDF document text
    • http://fygl.net/uploads/file/112332438004.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/xixoloberud.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/92854463276.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/69147266336.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/tudowusibipada.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/52737073995.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/bejuvasisoludoxexatima.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/20351407293.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/jatodumiwubased.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/19843579516.pdfIn PDF document text
    • http://vhktn.at/images/content/files/tagikuloj.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/zedazazuwomemorus.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/68840632251.pdfIn PDF document text
    • https://jetaime-shop.com/files/waxoxomukotu.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/37926824293.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210903144746.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210908_070558.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/bdac4580639eb76c3ff8f52bada7dd98/rumopababifoxekirawosuzoj.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/32101036167.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/73774606488.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/9069915252.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/foxusozeline.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d267894f9b---74720082647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=preposition+in+on+at+worksheetPDF 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_off0000cede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDE 10480 bytes
SHA-256: d956b84aa1bf53e35e9d78032d40f9139a7c7c1e8326ad4dbc56d951e12797f5
font_01_sfnt_off0000e6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B3 17104 bytes
SHA-256: ccc0c9dac9cc8e1645b889ad8524a88f9a8d506191501c1f44b4861e5bb4b359
font_02_sfnt_off000112eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.