Malicious PDF — malware analysis report

Static analysis result for SHA-256 566f90967f515ea8…

MALICIOUS

PDF

85.8 KB Created: 2021-09-20 02:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2fc8a6fecedc443ca74603f60e2e4e7b SHA-1: 18f7622a509997028712a99373e0eb5f2d62365e SHA-256: 566f90967f515ea8b94ed33d4369bf11b2a8a894f430adbea2a4f741c85a7d5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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://medvor.ru/uplcv?utm_term=fun+games+play+store PDF link annotation
    • http://szkolaprywatnaleszno.pl/userfiles/file/77347463878.pdfIn PDF document text
    • https://alpinashop.bg/files/wupopoporowi.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/wesobalusukupi.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091322342998.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e720307da---mapemojekoguziwezu.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc692bc1e3---kopemutubusarulonirepuni.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/womavapep.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/26361215969.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/kegizuxavevipitolo.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/56601305439.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109100318316805.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/62907911812.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/xujexaworepup.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/005217791909be4a5bf5b499f1f4f7a3/32497417609.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/wilomezebevidafo.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/letotijoferugiz.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/80525824848.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16147b1903a4ce---49146399210.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613edf91299c1---893636163.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/1606753391.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/riwekad.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/nimegitokozeba.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/jelositenuboxudonoz.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/lasipoxirupisa.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_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 18328 bytes
SHA-256: 162b97ca187e7cbcee168e921ce6011b314bfe581d9014fa72dbb5ed075a06e7
font_01_sfnt_off00011980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11980 10696 bytes
SHA-256: 3a1e4c9f3b992285fb463e0a73dae160eb133002ab9f2ce2fe71ba9171b9bfa2
font_02_sfnt_off00013214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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