Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f3b08ea4c265c0…

MALICIOUS

PDF

72.4 KB Created: 2021-09-11 05:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b42d46b186b23201dd8c820b35ff9538 SHA-1: 5325946fa9a0aad1f0c18cf43b9fadd5afb15c0e SHA-256: 46f3b08ea4c265c096ec4f86af96663ce828e325f8c76694bb4c6a34f6bf7769
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are structured as link farms on disposable hosting. The presence of these links suggests the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://studioaba.net/userfiles/files/1235302507.pdf In PDF document text
    • http://aceonlinementors.com/userfiles/file/75165075832.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/lenuwa.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/66830379783.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/92876420620.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/71492251583.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/wavowopimodejunozapaliz.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613062871c3c1---mariruwuleperefisinike.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130a616d885c---salufanagudodu.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff8e396a7f---81600209961.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/sewezoxawaxeporuxewut.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/fevowixof.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/28775394527.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/99339396388.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/besitav.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/33480994046.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/sotod.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/bumesudupevimatulesig.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/12078652179.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/72344760863.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/matuvixid.pdfIn PDF document text
    • http://sdds.be/userfiles/file/59547971540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=governor+of+poker+3+hack+mod+apkPDF link annotation
    • https://lapdonline.org/file/bofozopatanoni.pdfIn PDF document text
    • 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_off0000b4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D7 17612 bytes
SHA-256: 112c5e6be9e019a91bb5fe071ff715b0f5826bd36ef56016006cafcc1bf98aae
font_01_sfnt_off0000e344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5B 10848 bytes
SHA-256: 99508764767942a4ca53b52bf892d22640eb1e4648ae8501bb85cf214a4b96d7