Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf0c6d2589cf404…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 18:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 50019a987b2c3ea208c5e6ffaf8cdade SHA-1: b106f8010e44ddd3bca13128eb327e9e69aec3b9 SHA-256: ebf0c6d2589cf4045b67a9bc95a8085597e7dbb125cba5bccd45a1930d446a8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on disposable or compromised domains, suggesting a link farm designed to redirect users to malicious content. The presence of URLs like 'http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/ee88d3287606f468160f3047cac10b07/wazoferuxunekexumodigawa.pdf' indicates a pattern of hosting malicious files within compromised web server uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hacoauto.vn/upload/files/2543192601.pdf In PDF document text
    • https://equimat-cheval.fr/file/sobiketapezafe.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/99103857570.pdfIn PDF document text
    • https://istanajp2.com/contents/files/zirijaf.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/43794700754.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/kinowisesipigigasowebu.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/jikuse.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/ee88d3287606f468160f3047cac10b07/wazoferuxunekexumodigawa.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/jatetubuz.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/3594681597.pdfIn PDF document text
    • https://12waktu.com/contents/files/85798004178.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/nokutixuzujexafid.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/wibegejujubo.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/1630080429.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f52f290b31---89954728193.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/taturerajosok.pdfIn PDF document text
    • http://risme.vn/files/23668785002.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/zosugimazaxigewa.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/sabivipujasajobufudelo.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/fizoxu.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/93598510204.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/rolunovumo.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/85a7b50cd81f308a861f6a0c2f72147c/6209242687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=amazon+prime+video+apk+for+laptopPDF 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_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 10692 bytes
SHA-256: 4e05eaebfb091f2b2c6b4de10e4a519ebbd9d7bf03e117b94b22f52f23f66a66
font_02_sfnt_off00010a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A15 17548 bytes
SHA-256: 148354478eb5cfcc6d3cab4782414bbf682466e57669a3d8fb56d7838213d5b0