Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e84e8b45321220…

MALICIOUS

PDF

76.1 KB Created: 2021-09-19 22:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 43c7cc3e9479e00a8156578bb9fa5c58 SHA-1: 32dce1b7599ff3b58f5d14bce195a1b2b7bca2d5 SHA-256: 64e84e8b453212208951ff86c689335d7e969345789f890b11252f8ad58881e7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with attempts to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://propiedades.net/ckfinder/userfiles/files/59383339782.pdf In PDF document text
    • http://teifsepahan.com/files/file/fekemop.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/kokeziwesagaguxuvivi.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/dojurug.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/rokesiperanuxefan.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/pototomezugof.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/75891461343.pdfIn PDF document text
    • http://kgmda.com/upload/files/18271540648.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/lesubutowawizofiwexa.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/mifigi.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210907_B9DD40D86D3075FF.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/c1db9407215255ebf71ed5417c63b167/voxetatadukogepim.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/wupexojinodaxelazew.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/d0b8a2cd08f86e6837f1e5c26f4f3c77/46226414471.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/31776449378.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nudazedotazugebu.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/lisedasurebujuraso.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/ralapimo.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/64646844995.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a41a2d6a44---75031653320.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/direjudixisovumures.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/11257374772.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/zowapogugopuwejase.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109051921568132.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/durimiwiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=oxidative+phosphorylation+pogil+pdf+answer+keyPDF 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_off0000bf3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3B 19184 bytes
SHA-256: 2278b3bf3115ba60737c5915b2f93b589e1c5b9d3f45a82acbcc2705a239c636
font_01_sfnt_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10871 11264 bytes
SHA-256: b8728829c15d1c5ff9bdcaa879700945aa68e168db63dcac49e03095cf7d31e8

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