Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6999558c76f6755…

MALICIOUS

PDF

74.0 KB Created: 2021-09-15 19:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9c657ea426742716e1d458759abb7232 SHA-1: 5a92a051b1484871e3b5e8eeb0b6655d7d71b1a4 SHA-256: c6999558c76f67554d556ff8caf68fcebe39474fbc547cb86aec852644648d76
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which are part of link farms hosted on disposable or compromised domains, suggesting an attempt to distribute phishing content or malware. The presence of 'utm_term' parameters in some URLs further supports the idea of a campaign designed to attract users through deceptive means.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=dokkan+battle+dragon+stone+generator+no+human+verification PDF link annotation
    • http://thecuriosityshot.com/jidof.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/613c3a146717c8b8c63b7984c2cb5573/xezomibonevemus.pdfIn PDF document text
    • http://cbstav.cz/file/60064413947.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/1987538006.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/31170525300.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/53208751320.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/lanalazulotoxizuzam.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/48102012774.pdfIn PDF document text
    • https://red-adlay.com/upload/files/posibetijavokovozurol.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/zozav.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/51666715469.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e19c81207---61522318692.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///48976154768.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/41521724034.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/58514971184.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/19955236430.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/zelimetiguronifav.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc1cf9e067---diwixito.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/sowupolik.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/25521696790.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/nazun.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/96031008291.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/45172947168.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_off0000bb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4F 16896 bytes
SHA-256: 4322fa3d6beb27c8030842277fea6b0175706ce64d7c097e60c080447bc05976
font_01_sfnt_off0000e7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC2 11324 bytes
SHA-256: 4638e9424488bcb3e644b98ff13ed7de6dee39ab16df17be50ca217bcb128561