Malicious PDF — malware analysis report

Static analysis result for SHA-256 69be1a23028b9fb7…

MALICIOUS

PDF

104.5 KB Created: 2021-07-03 02:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: f3158a5285cab12390d5de3ecc475543 SHA-1: eddccf68d47809f5290752852d3f0f46d6632cc0 SHA-256: 69be1a23028b9fb74bdb4688775bb7d325b80ac314926cf02f57752d0528af4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/0400b494cd093ca310aad9d1eb49a0db/silarukokefex.pdf In PDF document text
    • http://cortabellanews.com/userimages/5091937960.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b5f19df89603943a0a54da74c99f4a29/pudil.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/36105027190.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b783c7ff2---29016762885.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cfa3bece4---80589518107.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/832d41e1577974089b2ac5c81b7ca67d/21686743449.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/lesmadqtcs5um90isou3sgnro1/wukiruridoriraxad.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/salufeletapufupezi.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/24876890886.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/174e9e09801553c5dd4be1582e6e8a56/gebod.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f66b75c807---woxulolikorefulajisopej.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f0d1e0b1e---misuronananuduwaxonu.pdfIn PDF document text
    • https://lesura.net/userfiles/file/pilanodixakudufisarikuw.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ec52c0c77---20055765214.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/06qidvpsrvpntsdj6ehh6lpuvl/gopefisamoxales.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/81719225967.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d3a40b50a---kesodig.pdfIn PDF document text
    • http://cichanski.com/Upload/file/zejesoxuzewajuniwebawizok.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/118d0817441a5b1ea506b0485cc0aaab/67141527043.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/45073965918.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/38743750071.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/jofolujasutawikokiba.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/48424489009.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ba8241f2e---bumotivemaxeseduje.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607848aabca49---15778054552.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/ct3jedld1kenulnff0mf4nha8d/vowusajimufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=friendswood+land+for+salePDF 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_off0001360d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360D 10312 bytes
SHA-256: 45801ffabfc0acbf1c878f2074b0ef211497fedb5b9827a8200b698129d153ec
font_01_sfnt_off00014d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16580 17976 bytes
SHA-256: ec136365a224b03b1ea8a42c03176167f944ce925022ece133d582b0e6d3a1bc

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