Malicious PDF — malware analysis report

Static analysis result for SHA-256 539db644891f4d8c…

MALICIOUS

PDF

94.0 KB Created: 2021-09-06 01:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5dd1d394ce139d1a386be56807b9f6fd SHA-1: 85641be00b54a87eb0e8de62185380e06c17ab2c SHA-256: 539db644891f4d8ccee8834819713f1b514ef91f7b5964bca3bd4c6d3336713d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan PDF. It contains a link farm pointing to various domains, many of which are hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or phish for information. The embedded URL 'https://synerhu.ru/uplcv?utm_term=be+rich+and+happy+robert+kiyosaki+pdf+free+download' further supports the lure of potentially unwanted or malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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=be+rich+and+happy+robert+kiyosaki+pdf+free+download PDF link annotation
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/54deb09a6cd974e6563ece20ecf5f2e6/85623355813.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/jetaziwovakixisurir.pdfIn PDF document text
    • https://indianpowerliftingfederation.com/userfiles/file/83556042557.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079de7555f96---73583278741.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c48e965608---4120546350.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/47433735517.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/lilox.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160858b17d6cdf---zoboxemowa.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/36319686550.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/fupatitipakonuw.pdfIn PDF document text
    • https://lasanisports.com/files/zesane.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/49517234743.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/80ef850a2c45c07cc60b520341f9ac03/65971526416.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/10373475472.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/s6mlkg9fo3ru8vgb0urtmonhv9/susisebekuditat.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/46674728214.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/98275434647.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/bumiju.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/jifuris.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/lodosopufolumevaxufupago.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/mepuja.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3419933c8---3315970662.pdfIn PDF document text
    • http://cascad-trans.ru/files/81110741915.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/6f0490496717cf8df6e3bde9f548dc6c/zazivijagonogaj.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_off0001058f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058F 11200 bytes
SHA-256: e00da5e46e4b870126730119a209c9070cfdc0cae084cf2e7a8ea74436bac498
font_01_sfnt_off00011f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A3 19124 bytes
SHA-256: 0326fa7c4cabb36c1425071fec4d0ada0c4cee5b597469bda0db7b46fda995f0

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