Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e83604afc5dd8f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 07:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b89dfb92032c7c502ced6a7701935c5d SHA-1: 023502f04d6f7a599b3e2dfcb37b0dfff6c80995 SHA-256: b2e83604afc5dd8fbc3d61db48dcdaf03edf52e76fbbed598e4f166236628285
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to various PDF files hosted on numerous domains, some of which appear to be compromised CMS uploads. This suggests the document's primary purpose is to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://udmvdpo.ru/images/files/42843170579.pdf In PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/jekasi.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/55279710924.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/4ae20e55b8749525f180a9078e5c0361/465083941.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/43057354395.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f594a3ce3---47196071570.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade9ac9e7f9---simenozoniva.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/tudalotupafal.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/maxemevemoledamob.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6f2c7b8e47afb20211dedab27568cddb/78261542481.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/wobigejapimiw.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/letifagukaxipoxekewedito.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/tozivat.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/tovox.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/4437618401.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0bdf0282a---88897930286.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/23168546144.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/nnouk8lih5ducqfpf4vl15o4v7/pitusukaxata.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c19ad085d---93680967600.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5fd0d09ca---piwukeburi.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/pitatigegapasaker.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=john+yorke+into+the+woods+pdf+download+freePDF link annotation
    • 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_off0000d928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD928 10876 bytes
SHA-256: 72a10f774fd4ae86242b891f429a0caa4399a1a5c2346ef2b51d6c61cba4d374
font_01_sfnt_off0000f259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF259 19104 bytes
SHA-256: d2765e4368a3d65c33dc39cca275103ac46a14aad67ea779ac870d9e838cc432
font_02_sfnt_off00012396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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