Malicious PDF — malware analysis report

Static analysis result for SHA-256 db78939db82e8799…

MALICIOUS

PDF

99.0 KB Created: 2021-07-28 07:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a12c5e54b7543fa3d92434555f43bda7 SHA-1: 0d9d67c3888800c5db1c98408910963ae67e993c SHA-256: db78939db82e87990bb6071e099f82ada12a95c0be4fce00a44fbe1806e083a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/a5a07db133a5d763aa15f956f71d64c5/beloleporumalofe.pdf In PDF document text
    • http://topas.lt/userfiles/file/finobasifatazewebagob.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/vubeteropivinerakudowafi.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/19760433398.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5f8ea493c---zowanaguwaxevesamelura.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608117eabce6f---sudekoriwezavutenal.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9374fb5bb1---faxufoja.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9010bad69---nikokiwoverowabalul.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///94649505098.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607959f53248f---kudarigogabulunamegegokuk.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/bfj8rpn73vhhgj99onoiihmjib/76787526294.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/16279084710.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/01b3e050ff4a8aaf8b4dc133e0140f82/regetoxeroj.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/bumuxirikukelos.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b644ffdc895---42339923927.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3d6a05198---41721976647.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/sexazarivowononosurebe.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/zasubazeno.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/famogodokavogud.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/sugifosevorusoxarev.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/zisuridejafigobe.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/jezorabig.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16082f13f9bba4---54391110153.pdfIn PDF document text
    • https://alutat.com/data/file/xanapuna.pdfIn PDF document text
    • https://superchills.com/userfiles/file/kujedazavetugoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=biology+practical+book+for+class+11+pdf+free+download+new+syllabusPDF 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_off00011980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11980 17440 bytes
SHA-256: 50059a6c3eca3d7963042897e7f4e6f08361b1bc12b66bc42c86976ee6693ae0
font_01_sfnt_off00014785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14785 11432 bytes
SHA-256: 23c917b66481d8437d0eee425d28162e1d4f571cb910fe4c330eeda9b5908fd3
font_02_sfnt_off00016273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16273 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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