Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4a6a74788ae726…

MALICIOUS

PDF

82.6 KB Created: 2021-07-13 02:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f24a45663c7bc90f8de88d2a80fe75ca SHA-1: de0d78cdb239c0bc521c704a202c618ff5f176fa SHA-256: 3f4a6a74788ae72653fa29ffa2a34ed1544d3a0a564683fbacf6fea5ee2577df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and a link farm structure strongly suggests the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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://soalmatematik.com/userfiles/file/46035469342.pdf In PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8121e89f7b6dbc3f8c463d05906e367b/wonaleled.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/13415189741.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/robukepi.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/8040758f9e21db23dbfe1ea85f4815c8/gisoz.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/40314800025.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/wexotonadobozasujodovine.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/lekarawu.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/d387727ac2ae8ff9040e3d07f97cb1b0/wakutujowozamodanon.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b8aec1ba4---fifikilo.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/25103057407.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebc841bcd9---weliramiromafivedoj.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8bf243494---48437291241.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/9ihvrfdvobi64q6rkh94pf63jh/12548207303.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdf61e408b---47870619496.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/nitibolojajiwize.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb0977103e---jusadasavapaxuwutazokuva.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/niwizotajiputodekorukoze.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/18501982397.pdfIn PDF document text
    • http://soles2walk.cz/data/file/85495703247.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e3c274648---segidapabuw.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/74190128085.pdfIn PDF document text
    • http://zuche0551.com/upload/file/6985040495.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08763a4c9---54839649805.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/gudosogogusoluwosale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=signs+of+passing+outPDF 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_off0000e109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 10428 bytes
SHA-256: 06b4f0597aac4012338e44dd8adc179a5305ddc4b05dbf27ebf8cbaf4a63eab9
font_01_sfnt_off0000f8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CE 17112 bytes
SHA-256: bd06264181ae3dae82ee3b446d494ceccd660153ec8961c1ccb8b6d002be2ae9
font_02_sfnt_off0001253c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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