Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a4259046a86255…

MALICIOUS

PDF

75.1 KB Created: 2021-09-20 03:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f6c1e47149a43f63768d771ea60e63f5 SHA-1: 1cb270db38f32f569e50310d5bd4e71f37f5d845 SHA-256: 71a4259046a862553ea0ee4cc7d787bb8e9ba3669a0151f4248b2a2cd003c68b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of numerous external URIs, many pointing to compromised CMS upload storage and disposable hosting, indicates a link farm designed to obscure the ultimate destination and potentially distribute phishing content or malware. ClamAV detection and ML classification strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://infrive.ru/uplcv?utm_term=iphone+12+vs+galaxy+s21+ultra PDF link annotation
    • https://asken.as/bilder/file/55830663386.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/21005401549.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc8dd86efe---2904371166.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/52800608565.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/94615763041.pdfIn PDF document text
    • https://simorgh.it/uploads/file/65667511324.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/13580426685.pdfIn PDF document text
    • http://fabtur.ru/upload/files/88457485524.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7ea26ca1---35893872148.pdfIn PDF document text
    • https://n-tlg.com/files/file/80395695969.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/13054005013.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210916_073C1ABC332A94FE.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161404679bc07f---zomipapu.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161464390c6f0d---48861026612.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/14776809327.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/1f707504a9a8156f2c16c94e2e9f315c/gilixelawatikev.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/nerazigadimewupetaxide.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/birozozabegitiluta.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-4/20210904105222320919.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/33849224372.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/padubudixawenoloxerug.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/15970112879.pdfIn PDF document text
    • http://rts-3.ru/upload/files/23612119868.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/52802721979.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_off0000c02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02C 17176 bytes
SHA-256: f4b36fae0a2b09cd282a64db276b682a8843331be26af23d8913541c8cd49eee
font_01_sfnt_off0000ece5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FC 10944 bytes
SHA-256: 27c9f1ccc92a22053fbb37bff7da9a2e147add1e3458afa5176d3c364b9d151e

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