Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d8f68430090880…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 01:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2ab6ec1fc85a125947125844fc26f117 SHA-1: c5c244fdb57fbd55a169e92ad638cbee1c8e8861 SHA-256: f8d8f68430090880f4e40833055108a88f5201ce6d2a3ab024f68e8428d23d77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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=honeywell+air+conditioner+controller+manual PDF link annotation
    • http://al-bandak.com/userfiles/file/73679316967.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083347319da8---95278877069.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/93530478478.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/favuviwafelukupulovefab.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/736f94fddf1425a595b3c5561355e089/mumoliniso.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/97159034117.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/db08eb3c9045946231031cdba4571011/zinukesufujewibike.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/wovejenames.pdfIn PDF document text
    • http://azizolace.cz/images/file/tadulawemenitazurow.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608692e6b9454---jagatidetonefatezuxiwi.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e1b9a97c16e---67898861466.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/tasopogudozinumepixe.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/dalozakoduluxakiwafav.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/48668343410.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/904c10ead15e02c117fde744d83dfb2e/bowarexogazamegejaxiwejit.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/48973772183.pdfIn PDF document text
    • https://digireg.cn/upload/54921512231.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/16744334849.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/21363598519.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098a96237855---86763379906.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cd91c31bb---2059880159.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/67156505698.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_off0000d77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77A 10652 bytes
SHA-256: 11aba3af0a244555c9c9983bbe7334e153af6a1e455d962531472ccde00899a7
font_01_sfnt_off0000efda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 17308 bytes
SHA-256: e61f749b2bdfeff5ab42854a487f0df60aaebbd6ba585cea12d457edc1480de6
font_02_sfnt_off00011ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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