Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c15f06b68aa8f3d…

MALICIOUS

PDF

80.2 KB Created: 2021-09-21 23:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1a7c1da8a0b8453f848d4160ad9c9f8f SHA-1: dc4c4781c3a4682b33a4ab81f4d8dd7b287338d7 SHA-256: 9c15f06b68aa8f3d220cb1168345bfe9f419c19d9854ac2edff7b8ea2e246fcc
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, indicating a link farm designed to redirect users. The presence of ClamAV detection and ML classification as malicious further supports this assessment. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://fujavietnam.com/images/Download/69897371486.pdf In PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a5298c740fc93d664f7aa7007a2344a9/85107612675.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/mogebedibibuvap.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/3708472407.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d509c55552574f4bd88f6ded1b07bc58/3073177303.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/97795969741.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/edce1b5423184f36afbbcaac1aa36ad7/57419726325.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613345925fb06---fobakixak.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/59276188881.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/zexofofujikaliwagidijozo.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/vorakewok.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/falewetekujafop.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/tewafexuk.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/73182720301.pdfIn PDF document text
    • http://xenangheli.vn/public/files/senigowopixedekezimafise.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/83893143975.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/2955604096.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ed8205489c736ee53a7de166371bdd34/56734833033.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/36816486331.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/kopuzexew.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/xerelu.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/fubilon.pdfIn PDF document text
    • https://msiutilities.net/documents/54364603549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=filmywap+hollywood+movies+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_off0000d538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD538 10700 bytes
SHA-256: 3d0bbcfcd1d2551f1106b62a7b5b8a4a8458236ed56ef675e84f13fc1dbf6d8e
font_01_sfnt_off0000ed8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8F 17488 bytes
SHA-256: 81e2475ce6b434b3607d66748631f5427e8f574f3a745349c1c21884eb3eb8a9
font_02_sfnt_off00011b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1