Malicious PDF — malware analysis report

Static analysis result for SHA-256 5031821a32463b9e…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 12:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4cd64970e8e33c36e3bde317892fffbd SHA-1: f9a4dbce9698b27e4471a46d047c60c8c5ed245f SHA-256: 5031821a32463b9ea07d670af0f8aad4bae079da6d5e4c9802b338ee3df12e83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the PDF functions as a link farm, directing users to numerous external URLs, many hosted on compromised websites or disposable domains. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities, hence the inclusion of T1059.007.

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://inwebjor.ru/uplcv?utm_term=their+there+they%27re+pdf PDF link annotation
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8cbbe1abdd466852fbadf14aafa89cde/61033071928.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/konezolarerugubolubuw.pdfIn PDF document text
    • http://italiancousins.net/clients/5/54/54f3d33123424807706abe9154268524/File/modutasavoxozilopuga.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/pojav.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/tibalawi.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/laligutufikirokokedixezuk.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b2d5030bc---jovifubugo.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/vuvutibujazakin.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160884edfb7932---rupazuwakotitekararubi.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/28970231221.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/vukipaxupumajotosolifov.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/filitug.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/99592511412.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/gibitiluxuva.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/18721047483.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/44684152756.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/12376370699.pdfIn PDF document text
    • http://afro-safari.com/upload/files/12840062615.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/molotalij.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/cctbgt3c7usgitedthrq0o9nc7/tafedolukizasupunukulut.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/82ae140b3e5d2393901009225933dbea/51718037679.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873c3760904---20580110791.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_off0000d4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ece1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE1 21300 bytes
SHA-256: 9e73c109a27e304b8a5b72be7bac90e2622f693fbd3f09f23dedf78d8e277b02
font_02_sfnt_off0001223d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223D 10104 bytes
SHA-256: 2a8c732c86bec75515e5d3955f965e57898ea9504f96331e859b7efbb6350e0d

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