Malicious PDF — malware analysis report

Static analysis result for SHA-256 77314333a03c3adb…

MALICIOUS

PDF

88.7 KB Created: 2021-08-10 23:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9f9b6aae5077580ac1e916fc84e98de1 SHA-1: b4259f19a0851b298bce66a08afba079341dee9a SHA-256: 77314333a03c3adb15ae471cb28e3a2177367ca176f5d95fe9480c8ff8906bc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The structure of the PDF, acting as a link farm, is a common technique for distributing malicious payloads or redirecting users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://medvor.ru/uplcv?utm_term=run+3+google+sites+76 PDF link annotation
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/3b4365008d401dd7613da6eee21d5366/567847811.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c53b2b66ce---51795312090.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/29847198582.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/20198734803.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098a1ba07abf---37872145121.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/naxujokij.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/wibizoxulawukugovixi.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608123a2517c8---79633553151.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/19553398132.pdfIn PDF document text
    • https://limsurdua.com/contents//files/40744355238.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/sagasisapunenanevumubuju.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa4d4d8a3f---gelawonised.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ed247bf64---dazukepepezebefivaligetur.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/85887700869.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/36720199082.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6bb51c4a6---27254736585.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/6rlnni5po3f284foikdiolhqfc/16054935074.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c65d206db---nagibetigifavolaxuvepes.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4d658ef24---40765302125.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/foroto.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/b977d2bbf4be4eeb992668a755b081de/vugukijurenopuxibofo.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/11914508699.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/7a101d44b426d73a0500494a1d13cf17/85794226928.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_off0000f56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7F 17164 bytes
SHA-256: c9a07b9a986e5489db056ef4ebade2bb2b24d4c9bd1338f1952a3cbe4871a8bd
font_02_sfnt_off00013a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A48 10556 bytes
SHA-256: f4405db833f0c68f6205fae498f79ef8fdc17b707f35ddb44ffb37d4db1dd7a8

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