Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbff758c78e8952…

MALICIOUS

PDF

75.6 KB Created: 2021-09-20 15:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d689e805c7fdc707df09ce553763ea01 SHA-1: 837e47d8cf6b83203407e66048182f816b0eae2a SHA-256: dcbff758c78e8952338d6dcee069a2f098ad6697f80da90ca46d0c6d09da227e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains. The heuristic firings indicate a high likelihood of malicious intent, specifically related to directing users to potentially harmful content. ClamAV detection further confirms the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=android+send+scheduled+text PDF link annotation
    • http://hotdeals24x7.com/ci/userfiles/files/36897948600.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/46330693034.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/firusepas.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1db4518bf549b8971a17ed87a3a6cddf/tebesotuwogatipajarana.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/99511812070.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/gepakixenuvor.pdfIn PDF document text
    • http://darec.sk/files/files/zunusilavepes.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/40118004539.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/gavuxidos.pdfIn PDF document text
    • http://espokebar.com/uploads/files/71588746707.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/bubanusuxuxunozob.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/68869878348.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/41f69cdf550ad6c5d1d19e078719b268/23196566818.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf50961917---wexonaditiberimoped.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/33816923798.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/gemoxaxejebali.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/56734964607.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/wurafipuxixa.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/lomax.pdfIn PDF document text
    • http://kelsenator.com/userimages/5556799821.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136ffe6cafe6---58271102738.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/54733752142.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/881951a8d4773b142b2d2a916a2ca7bd/jerufujusogebofezuzade.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_off0000c632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 16652 bytes
SHA-256: b0c7ad37dd5b4efb18409084d38cf98c79e7ea75ed7b225b62e5fbf1f434f976
font_02_sfnt_off00010941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10941 10488 bytes
SHA-256: 53686c0f52eaf4873f7c72869e76a38009461ce16672d487830d3672a1fbfda6

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