Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d0a958de92cfb8…

MALICIOUS

PDF

84.8 KB Created: 2021-09-08 23:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8080ef7e19b1bbecac375ae321da9a1a SHA-1: cb6d12a20a61e135aa69184b014635b512701d3d SHA-256: f0d0a958de92cfb8a581ce698f122431b84588d81db3405869e9c488cfee6717
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate an attempt to lead users to malicious content, likely for phishing or further malware delivery.

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 https://nenmongdangquang.com/upload/files/rajovuwokudagozanoga.pdf In PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/f8mr9fgd5e9uv1kq07tjfjq037/2409735485.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/49728123633.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/38105199532.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/29900917932.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136be24acb5b---42165620187.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/kekivelirikinejiju.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161380489f21cc---vuvadanawovugubuvedixeto.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/39149698092.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/gogetabopafosutopob.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/27009173155.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/watidozumonuvemelonebosis.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/3843125164.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/venovepefuvikobagoloruwi.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/54489013598.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/bijufif.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/73010904176.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/1626009571.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/jorinugovepupejev.pdfIn PDF document text
    • https://atiksigorta.com/files/basegilikuk.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/tagaxavuvekutesoduz.pdfIn PDF document text
    • http://melvin.cz/data/26563740488.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7bd7a2b0d---tebivixawux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=factory+reset+moto+g8PDF 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_off0000e5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A7 18276 bytes
SHA-256: e00144e7444035099dff64121a3e47a6c79c48c4988e3c491a94fff30d21a609
font_01_sfnt_off00011509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D20 10632 bytes
SHA-256: aba5f46fde7228320cc1ee367fe4289219ff1dca25dcfd376b052921b71e9272