Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e94f55153bba4a3…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 07:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: befd86daa67a2ac2441f6aafdaaf305d SHA-1: 6f1a2609ca3198c8b3935aa343949cedb4fd08a6 SHA-256: 7e94f55153bba4a303bc941ca76659f3f004a2848898942376591d29a2ed0e2d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and multiple external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ameshamagazine.com/js/upload/files/83949285135.pdf In PDF document text
    • http://midel.me/userfiles/file/40312882996.pdfIn PDF document text
    • http://alhs1973.com/clients/64426/File/7645962315.pdfIn PDF document text
    • https://www.crpm.ch/ck/ckfinder/userfiles/files/levijozalegusajiva.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/dufimuwaxefanuzeboke.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/10b961a093b6b2b4ead1efae3ac406e5/zogozofiz.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4c5a6e416---51038709144.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/13187611377.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a404b875e4a---nasobiboruzi.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161032bd46fbff---51722694662.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/14a4a04986bb56363629fdeb3c0036cd/xuxatatibuxesupawa.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3edd5a806b---kotomovilajefixadudufet.pdfIn PDF document text
    • https://ekransamara.ru/files/7539547057.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/pujemevufubonemufisor.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/26f1e9f6badf3300b08da8f8b0757cf4/xavefudomorutut.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/didukonowu.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7c48b9cdbd1bde2d2e88f237d3af39e7/32404915786.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/vokujebaroboni.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/fc13151015f161b0677cfef4f8defc40/32190770169.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abcfb44af93---30154901538.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/natenewekutigo.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/cf33f02e7614e4aecf5bda96b32c2866/mebir.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/ae287ae1955bb85ee04b7416c0f3dfa5/79872048909.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/zenede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=r13+homeopathic+medicine+for+pilesPDF link annotation
    • 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_off0000db93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 11156 bytes
SHA-256: 776ad8fea99adf4a91739c2477f020f9192e026f02ed4ca50d62c9240d15faa3
font_01_sfnt_off0000f582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D94 18736 bytes
SHA-256: 7b9500e18ca8c6a60855deb3f5362aa7f7757988a224782fb9137e5ca13329c9

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