Malicious PDF — malware analysis report

Static analysis result for SHA-256 2506858630855f26…

MALICIOUS

PDF

88.9 KB Created: 2021-09-02 06:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b86d7ce66d2dae4cc76c0ce237710b52 SHA-1: 984efb7950d014120578247fca318f418fc9a588 SHA-256: 2506858630855f260d8d93cdfd401565e266619fbe604567d3fef79da69d3a10
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing an embedded JavaScript stream, which is often used to download and execute malicious payloads. The numerous external links, many pointing to compromised WordPress sites, further indicate a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=quotidiano+in+pdf PDF link annotation
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cc74bc58197---xirelanegakopisazabufarof.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/farisudebufibe.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160836c5576357---vuvemijorupovu.pdfIn PDF document text
    • http://rld-carbon.ru/file/majanufuganodorarodupasis.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/8cf8caf698cdc89187967bef4e6855f9/53570795646.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/54468832954.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160778694b51ad---16635396166.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/e1ce1d9e9a5b9b9a3bcbfa1c98081de1/88732970757.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/445c694e5fb36092463e9f0fa4aa26dd/bumejejopejuxetotegusiso.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/dojudipidifu.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/bolibubuwixomabened.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/80288887167.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984c4346161---vabeme.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/melalobubafuliwutulav.pdfIn PDF document text
    • http://kotolantopeni.cz/file/meregazulewe.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb79c6df2d---45034634004.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/sozuwikawet.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/37180466fd5e66c48a665f0a3dc4727c/25770883439.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/vapak.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/9782402120.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/f912d58e6b2afd1252bf9a2c802a8944/76123091091.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/40422627840.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/lifopen.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080dd5a429de---tifiz.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_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 10204 bytes
SHA-256: 3be73210cbdd3cbeb6325f5f6db7889c31756705f8b5a8e9ef4bda090fe0fb37
font_01_sfnt_off0001094c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094C 19788 bytes
SHA-256: 9900b62d0dcbae949442a1a5154c600329124ea111b0e0bcbab9b443657cbf7e
font_02_sfnt_off00013d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1