Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7dd69817dfe45b4…

MALICIOUS

PDF

69.3 KB Created: 2021-09-04 15:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4256bb0a21ce1000084991ccb31fa5e3 SHA-1: e115ae1776139d36aaf07c073603f8d59e76339b SHA-256: c7dd69817dfe45b41b7e61cdbea2527c0f03ca09a20ab1eb319f4299b17a802c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm for distributing malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=saniclear+20+manual PDF link annotation
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/sipenivinatalanilubidu.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/fabtg8k7472mv2g4jq1kl02tus/wozawijirisin.pdfIn PDF document text
    • http://afslab.asia/upload/files/57232162391.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/vibunemitamomotozubef.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/95966777688.pdfIn PDF document text
    • https://purefeeling8.com/data/file/xapakibuk.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/77837581907.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/80956981083.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab993809fd---vararimo.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/7aaac7dee60a79bd687d2428480d4fb5/nofupexesetuvataxadagi.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/8c381937f5fb8471fc1b795eb5a697a9/jaxemovadobazoropifenu.pdfIn PDF document text
    • https://bamor.org/userfiles/file/87492759367.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/wewoditezozamujubodamot.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/76544730906.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/65919507670.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607166a397103---futawuwi.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/22664446017.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/83896825721.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/21000921284.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/90650384838.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/tudigodiniboragaxija.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/e2b9cc637fa54d36cb31ef0c811c3a8d/93207482739.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/xijelijagoze.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/93486155948.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_off0000b46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46D 10424 bytes
SHA-256: 1f52461b4906fd7d7829a9616fbedf45d13cf819bc8014b0ba63a5ffae5badf8
font_01_sfnt_off0000cc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC10 14236 bytes
SHA-256: db10195735e831feb4842c67603729ac6927bc1b42b42b5f9ac167c69d6e10d6
font_02_sfnt_off0000ef67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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