Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f08be0aa4868cb9…

MALICIOUS

PDF

90.0 KB Created: 2021-10-10 07:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1e41160a045178f5e9fed7ae3280e6e3 SHA-1: fbe00a802b9c6bc2149d24e1f1989be1711e74a9 SHA-256: 0f08be0aa4868cb9a2bb17b0fa501e5e2d2a85843a13e7882c90377544511fdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://cructi.ru/uplcv?utm_term=is+oil+a+saturated+fat PDF link annotation
    • https://pemaboutiquehotel.com/assets/userfiles/files/27947029384.pdfIn PDF document text
    • https://mytopics.it/uploads/file/fadipixeva.pdfIn PDF document text
    • https://aademvegabaja.org/images/image/83731540031.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/tixamigi.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161560cef9d878---68556358615.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/kekowemefekavipifimi.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/gobaro.pdfIn PDF document text
    • http://ddnepal.com/assets/userfiles/files/dudarik.pdfIn PDF document text
    • http://tongdingjixie.com/d/files/rosazulaxaxusisewazaj.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/gevigu.pdfIn PDF document text
    • https://franchisevisions.com/broker-site/files/files/loniworuge.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/12473474393.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///51556090434.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/52d3e1197fa1e8a757f0b9c4a6a6f8e7/40405830364.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/43753269621.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/peribososixawuzizu.pdfIn PDF document text
    • http://abbaorphancare.org/survey/userfiles/files/bukigi.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/2872163107.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/70785004559.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/xejukaposubeg.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/kupitebubomopegazesas.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615265fae94b9---lufir.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/salozanirotowabel.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/27867396510.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/80840657591.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/sukavef.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_off0000f758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6A 19896 bytes
SHA-256: d5b5d0f5a01c5460fdfd09d70fec6c47f2e57074c5c9e499b6a030e17ac977ad
font_02_sfnt_off000142de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DE 10296 bytes
SHA-256: 11d974c804b06ef391aab9b2797c69353b276a5b743c37c866f26a3fa3c04a48

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