Malicious PDF — malware analysis report

Static analysis result for SHA-256 806a237ed57114e7…

MALICIOUS

PDF

88.2 KB Created: 2021-09-06 08:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b9dc6f2bfa495926cd7f3f9945e99d7f SHA-1: cde0cd6d729ae72628f74172b63bb2c3fbcb7af1 SHA-256: 806a237ed57114e7edb65cbefc478aaabddf5d5936d4929d94fbdc5e3e832cab
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The file likely serves as an initial lure, potentially leading to further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/dinodalawewupodoliro.pdf In PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/554c82ca53273d1ecbfd2c6d2ea67484/19963181689.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/i8ij0mppeb0hlcu940it5a6ja2/nakaxilavenodogoful.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/v20m8h6j0i5g3jf4pguq8slh11/20969711612.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/xobezugilagosi.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/1130920994.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0b3d3c7bb0fa0d3f12ea8fbead448a63/radudafejulofiwuworejakog.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/wijuderupenozexuwam.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088d487b110b---77240147193.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/66000100413.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/tepekiveditojenojuwu.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794b04901d6---nesuwupufub.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/03888672371bd3edb4e2cdec13a0d1f0/zupiriwudavosulezasiwa.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a64fcce6eb6---72419844987.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/waxizapubafarunopewozod.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/10395173543.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/wotavi.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7a6561559---13262816900.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f7c9ad44bf8---girovojosuron.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/50310970495.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/lofatopakexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=intuitive+eating+worksheetsPDF 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_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5D 10636 bytes
SHA-256: 9daf5b17ab4cfb982ac5ce32231d08771513775382fd60a8a0e1c9dc97d750e6
font_02_sfnt_off000123c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C0 18268 bytes
SHA-256: 16a392ce7557750a8818bbe24893430761ad6be5ac4a03a2239089e01fb8b17f

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