Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6a0aa61c5217b9…

MALICIOUS

PDF

79.3 KB Created: 2021-09-20 05:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3a6f930eccc7ba6b7eeb426d90e1fd4 SHA-1: 7104e328dc8b5559b2ac3132af78caabe7b5b2f4 SHA-256: 8f6a0aa61c5217b9b9c803d64b72112c1d10c5a0bdbab99745acd0a55cf843cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=vector+drawable+online PDF link annotation
    • https://nabil-doukali.com/userfiles/file/15124228558.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/22282106173.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/guruganokilolatun.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/61231957949.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/lobog.pdfIn PDF document text
    • http://compsult.net/userfiles/file/muledejazumo.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/79814932278.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/17179fea2e36bb90302d43e0b25ce089/mexulojixejizumoriv.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614375a7dbe7b---54940917807.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/salasiwo.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/ritokiju.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc491f2ef9---xujeres.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/63931611122.pdfIn PDF document text
    • https://estoniapools.com/contents/files/33408249917.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/96582802878.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-18-15-06-18-51.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/3658291095.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/69469774949.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9884eb060f190c9d4a879da53ccdef10/gitupikezujogokonudemixaf.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/24212106682.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/jaguxerusogejazumoku.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/nowuvarel.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/80208149226.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_off0000d097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 10388 bytes
SHA-256: 88e13ec29fe3ac61411c86ead3fb9a7e30c7a06e95a34c5e57e8982d55df13ab
font_02_sfnt_off00010052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10052 17956 bytes
SHA-256: 0ace58a15e6ea3a09c91e11bd5a80384f3280db271fc50c9ee10b90fdceb52b8

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