Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de286e975927f7f…

MALICIOUS

PDF

89.2 KB Created: 2021-08-09 02:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3f0655d8650bd2b56dadc7bf6aba08b4 SHA-1: 3e4f22d8d6cc8ccd396861a8e9064afc93762ce1 SHA-256: 9de286e975927f7fbfd72c44f27a9ca9f364f42e04d7f72af98f24dc190c1c4b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=catia+v5+64+bit+crack PDF link annotation
    • http://tuderprogettazione.it/userfiles/files/losotigukelipadaruzorej.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/rmtuks9489pe2l04u05r0fkfhe/tuboli.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/sotirokuvuf.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084df8c0c2f9---wokurixi.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/acc969a9351e7041ba8550c967c53774/79239452716.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//lezopa.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/50649780952.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/i43ttd2tq7g4nb08pk00elss35/67214457451.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/qg6a7t8luim737skcfl9ftl2lt/82575229036.pdfIn PDF document text
    • http://azizolace.cz/images/file/nozasubefebovefojesivezaz.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/9c6271a99e7a19809bd1268290e2deeb/30544383588.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b200df2c8c0---9034271267.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/8213892692.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/50460040586.pdfIn PDF document text
    • https://netpage.info/userfiles/file/22740698688.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/52083078663.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/6817639806.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/66973939009.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/fc8024ced4e5e4a28a0b947e572a8e8a/67627289441.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/83611488782.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae83fd4c32d---84919210371.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/sfheub41jelbr833h2r219fu05/99137739972.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/rujivufuguvimelazozujexu.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b860e18fc5---pozaxezokejurajuwa.pdfIn PDF document text
    • https://lapdonline.org/file/kenanazapizerakegex.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_off0000f6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E9 10364 bytes
SHA-256: 85e49530df244c6236e6d00e750b9542e55a108924fdc49fea2f57de5e901f20
font_01_sfnt_off00010e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E97 18044 bytes
SHA-256: b8480f3114cc67442535ee2f945242d71f4994bfeb9ec0e616d11fc5c5c1d730
font_02_sfnt_off00013e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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