Malicious PDF — malware analysis report

Static analysis result for SHA-256 4411edf8697e23ef…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 03:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f3e930c25485a702ee387564f9100d9f SHA-1: 0ef9811c1fbec1b557a9fea5354f3a604b0960cc SHA-256: 4411edf8697e23ef4308868ab4daf8784a05baeca7f4dc8e0fde9e6ee1865fa8
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS platforms or disposable domains. This suggests the PDF is used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=mx+player+codec+eac3 PDF link annotation
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/vumosuzavapepadeduge.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/13990294598.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/38471181522.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/lajevu.pdfIn PDF document text
    • http://jadeite.ru/images/file/tokinozuwabixeguvolevadiz.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/78191244561.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/momaxozetadew.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/d2f63052f588b3754adc5e71170b0473.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/morixagabobezarole.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/48176809867.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/jivumilujapemonubunamazet.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/vegimow.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/19761035834.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/wakanofid.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109081922037783.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/xunafiwipakiriviga.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ndaf4j03c8as6frigo4ok7pcd7/2000126995.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b496aa1e53---vumakukevominuberolilobat.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee0a445f0f---1845135995.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/50002212929.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/34741326442.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210914_D6E414D218C24C12.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16138fa0a64c4c---61536595884.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/68949127814.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_off0000d62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 17528 bytes
SHA-256: 5b81c7d2bf581c20de6ef8237bdb1162c57a121af0e45f2e90e4832b5acf7921
font_02_sfnt_off00011bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDF 10428 bytes
SHA-256: 8e7d28a876bda1a77bb0905bd71750c945fc34af5a8aecdbd5af7a1338beafdc

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