Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3af56f36cd137eb…

MALICIOUS

PDF

94.1 KB Created: 2021-07-17 20:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 33b8b6a58fc8ce15519c556b0cd51ddb SHA-1: 829f6e496090c1eb9c0e8dee6dc0ca56bb23a421 SHA-256: a3af56f36cd137ebd97e557dc6049d1f3ffe4516531c86d2ea470a3375ada977
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and multiple URLs pointing to compromised WordPress sites, suggesting it's designed to host and distribute malicious content. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 http://interel-rus.ru/test/sites/default/files/file/jafoxigokiberijusetu.pdf In PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/77282776b334b20310c79d4814bd27b8/43338383741.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d66197b1e80---1367684518.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a11f892b8---53908984988.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3ea4e650d---gudeganujaxujalopazetano.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/00461943f2834554004ccc8efb06a683/93459073722.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/86c16b9dd9809a0c7ec227ff6fa77aa5/kipokadop.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/jikejovavowefu.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/90997101796.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/rereve.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/c709359592816b36e72a32d5ab433cfc/lojam.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/5uat6d16f39rqada6ro03nfb62/99124144437.pdfIn PDF document text
    • https://flyags.com/editorResources/file///tilaxini.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f00f5769d019b0db1e135a7c67fd1f11/genud.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/66932078137.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbdfcebaa0---pikomekopij.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/18619744545.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/4ec983bfdd9db7446f43fb9504b7541d/34942531463.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/87551460030.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/vuzuposano.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/km3iuqega3eaefmo13am6ba0t5/wirovogowonanokubojidag.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c02c574998e3a433616a6557b8d0619f/lerisonolikoxefipuk.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/f1c331d00d0d791e9e29366e6e80c7db/71609937780.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/82541114073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=hide+and+show+div+in+javascriptPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 10840 bytes
SHA-256: 19a14e313d68de4910287bb46fb1918210e83599622da8a3358fe5954735e32e
font_01_sfnt_off00010f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F28 16116 bytes
SHA-256: 74ea40c6abafff908ba0a862ebf25ee1d47d31f530ca964bdc695191fb21b084
font_02_sfnt_off0001247c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247C 17496 bytes
SHA-256: eb5a41cf8d09f229f86098d2012900ac6e3351a4787ac5a4b4ab8cd4ebdfc6ea
font_03_sfnt_off00015283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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