Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d315cc1095abf42…

MALICIOUS

PDF

88.2 KB Created: 2021-07-03 05:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2e4136fce43ad5a1839068e9fe6963f5 SHA-1: 63016609216821dc8a5701758c80d39908d3c558 SHA-256: 5d315cc1095abf42c5c3ac7e1bb1bc6090580459a0ee176915bcef30c55331e2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that point to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the structure and embedded links are indicative of a malicious PDF designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=ancient+symbols+and+meanings+pdf PDF link annotation
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d42b72594dbfa69d281255cbb377b63e/68589954261.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b76c5151bcb391c139fed04690e32ca6/mibipabigu.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/64863932378.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/jaxagogosatalaraxaraw.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/navozu.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ce2f6bb60---95654750233.pdfPDF link annotation
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094798520a58---45436075634.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080ed782c6a4---54411714998.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/68559275698.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/45907940346.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/ligegilefamodetur.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2e5aef777---16367604292.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffda0d4367---97791287825.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160976ecdad26e---voxuk.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621034069.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/44331674127.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/803bbf0ade78f33c4e013e0c647cda40/subajunis.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/ribuzebikukilajuvenur.pdfIn PDF document text
    • https://kede.org/userfiles/file/95820146953.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075462976596---28575368769.pdfIn PDF document text
    • http://come2menorca.com/images/file/xenufipijerinofevulaj.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa136c66de---kikapasixo.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/8da8eohkgl0pm2on1nc1r7jmiv/rorobabezugar.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b1241534b---fipijejijiwokidasop.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/b42a3bafac6a101fd1785bb20ca02b60/18496672455.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/fasixeko.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_off0000f301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 17688 bytes
SHA-256: f8cd5b7d5d6d6e71e19a850295fa73d6a8692553aac30af7cd73e913e6faf150
font_01_sfnt_off00012180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12180 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13997 11096 bytes
SHA-256: e0d618091d5b48bd6a43f3d931493817b6d461498c27b7e99492873d317a7684

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