Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1a8f5d28f63b58…

MALICIOUS

PDF

138.4 KB Created: 2021-08-08 03:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 69b8b1e4016cf3ea98e94b372bf3c106 SHA-1: cf7951dfcccf1abb27940d5440872a18a59cd011 SHA-256: 4f1a8f5d28f63b58ba575bed5c270c1f2499cc877d144f6586c809da6cf6d6f1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://scheiden-maassluis.nl/uploads//file/xasuzekipuwatupuputiremup.pdf In PDF document text
    • http://elisa5888.com/shopadmin/upload/files/90187083744.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/75192994896.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a72c3263f3---saruradarofi.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608188fe4c603---39002956810.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/sudorefejetekugixo.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/vulelaziwuneva.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/21439360325.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/68a4a075ae71d2e4c624c4b207787959/ririnebubesevavim.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2c251c2fd41c3e7e1dbbd0edd2d5a9b5/sajilujogukuwake.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/34843009817.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a83715e3d---95712264913.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/39660732312.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7d10435da1cd6234133a084222b9acde/kafafapojonava.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084afb9582ab---dozot.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/91989915540.pdfIn PDF document text
    • https://icfas.net/icfas_new/dev/ckfinder/userfiles/files/vutesaji.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/739861f3d07a1ac7077aebeae486dffb/lowabulifidevovoxijuk.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b715ee3bc---43722021427.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/fde1b1bdf436c6d6378830f5fe3ffc95/48613837491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=victor+hugo+sefiller+konusuPDF 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_off0001bb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB00 19508 bytes
SHA-256: 5bb4b0a19c5ab24009915fd7e68bb1595439c915fa558a664d7b79b4d95b7525
font_01_sfnt_off0001e9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E9F3 10612 bytes
SHA-256: 61cc92c346db86f5471cdd53a827d3a6a1368c7f3aacd07cf6a08aa6e85fe92f
font_02_sfnt_off00020235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20235 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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