Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc24b007fc7a17a…

MALICIOUS

PDF

78.7 KB Created: 2021-09-17 12:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2ea5af5fae61fe6f9de6581316f97854 SHA-1: 6719f4efa0b5c122b1bbf56801fea30086f0f266 SHA-256: 1fc24b007fc7a17a4d9cd53b333ea779ae2e5393369b669718c40d3cf3fc5631
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document body is heavily obfuscated, but heuristics indicate it functions as a link farm, directing users to various external URLs, some hosted on compromised WordPress sites. The presence of a 'Browser extension / update installation lure' heuristic strongly suggests a social engineering tactic to prompt the user to download and execute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://crysiq.ru/uplcv?utm_term=android+1+mod PDF link annotation
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/20d0fce62ae4920cbe6a69a41a809b27/24895716717.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/xinelipisixex.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/18821913717.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/doponezageko.pdfIn PDF document text
    • http://grimastone.ru/files/60822201404.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/38511469024.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/zakopesoworekekudune.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d31a8ec932---9030165722.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/20988250225.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/60217939307.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161445cdd8fed3---73408123831.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/gujogalogozirepegamu.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/94773473771.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/24294734123.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8b37a5b50---4218367378.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/toxutosudop.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/61507326853.pdfIn PDF document text
    • http://eternoohydro.com/d/files/gigopubagisinujitimi.pdfIn PDF document text
    • http://hotechike.com/files/files/67760146180.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/dexonitadotebej.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/werikunanasopumezedotex.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/23014568503.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140066821504---gemudo.pdfIn PDF document text
    • http://itena.si/uporabnik/file/mugiz.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/daletekebivafelawajebab.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/tagiripazu.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_off0000d124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD124 18100 bytes
SHA-256: a76b329897c5d9007d0b9effc387fcfb7ce4e9cdad00a139d76f030308411aed
font_01_sfnt_off0000ff7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7C 9836 bytes
SHA-256: 603df8ca43a3cd7a7f533c1e1cea5c4aef1bc2cb50971b341652b4981f655e5b
font_02_sfnt_off000114fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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