Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed0f64f6d791dd5d…

MALICIOUS

PDF

79.3 KB Created: 2021-09-16 00:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1797eea678f57f0c924ac9239247f5e7 SHA-1: f201a52f213a7e889146bff9c766b88de690f2a5 SHA-256: ed0f64f6d791dd5ddf420f093bf1b19ae9f45a516eb26a43114577b96602f53b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, including those hosted on compromised CMS platforms. The presence of 'utm_term' parameters suggests an attempt to track user engagement, common in phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://synerhu.ru/uplcv?utm_term=zombie+avengers+apk PDF link annotation
    • https://lordoptika.hu/files/files/nazofabox.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/zugopelera.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109060704001341.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e96399327d---dotosatofemekebadavuv.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/76853724077.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136c8ce96523---detutosaxeraz.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/72426544078.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/34bd9ddc672366ad6af97b5637c8adf4/metevujopepuru.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/podujole.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210905131626.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/ff3425aa37e50f1595e5602da71c3191/9761205527.pdfIn PDF document text
    • https://ocw.tw/uploads/files/luzexafomujesenozima.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/7469354609.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/4345294976.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/26065480698.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/mijepe.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/78009175942.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/69663330408.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/getamokaxijizokoka.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zulirirore.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138ff8b94dec---fefukot.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/xonanesigemesofe.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/vokoxegefoxavixat.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_off0000d0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E3 18008 bytes
SHA-256: eed85e63df669d5aca07ee95961e7d3547c7d6f97285ba4e33eae4c887d572d8
font_01_sfnt_off0000ffc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC1 10712 bytes
SHA-256: d4b7aafdf5275a35e870bd49d437457f1ef8420b6d3f803fc13e93ce1b8cc6ec
font_02_sfnt_off00011829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1