Malicious PDF — malware analysis report

Static analysis result for SHA-256 58728349268096b6…

MALICIOUS

PDF

81.2 KB Created: 2021-07-01 23:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2afdf7efe9315ad559c513b8574a60f1 SHA-1: 1c0668013d0c3d0b111ed6426f51390c7b47821a SHA-256: 58728349268096b6f792eb77fa3a91ca4b748af783b9ffb562f08c5bba2c9822
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

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 https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731028ccd28---jiloxonegale.pdf In PDF document text
    • http://cphs1970.net/clients/877309/File/56058983860.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/fkgm26vv6h2m47rj9hd208gsd8/56531159826.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c748aeba4da7b067c23666ea9e313aa/76256617603.pdfIn PDF document text
    • http://vejwun.cz/images/38185766138.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/valiw.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/39d7285a8f12bd933ae9af711658a8ad/somobapulepufewinokol.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc0835fd18---pexabekowodovir.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f702fd93a8---50971704538.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/64956228367.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/82633678676.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160846c6512b24---72517521148.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/11046000783.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16072bdb6e8ef8---tapegisixunifapilijotix.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/leduniwomafanixe.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/aae64d1cf2376c6672268271fa48205f/35044060501.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7084909f9---77696410409.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/4uf69lpg4r19he98fgpllduc82/xobaguwogugoxolew.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8e28c437d---kovubaxabilurusirig.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/403e8b615ba742d86656fe7cbb5dbcab/8785930434.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/u4i6ntf5soc3v1ric3omon6lqa/13415588418.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/17240122521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=300+meters+into+feetPDF 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_off0000dad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD2 10364 bytes
SHA-256: e59c4defeefc5703fc9e5d8b7eec772d7faba07a45574179b4fb8ce9fb09c285
font_01_sfnt_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 17260 bytes
SHA-256: b6c1718e52a4d617c40c6103b69f6cf28432f61b21e30e0951c43b39f300b8aa
font_02_sfnt_off00011f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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