Malicious PDF — malware analysis report

Static analysis result for SHA-256 502e5cd52ec6fd67…

MALICIOUS

PDF

76.6 KB Created: 2021-09-08 21:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ff5f3036bbdcc4d4b8500222d8a78fa SHA-1: b483a2b6d153e6608ae58c5a26c6ea27f93268b3 SHA-256: 502e5cd52ec6fd6702efb565ae1560186ea3c1ce8f2da9b5feb74825e7653f4d
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 compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of a link farm on disposable hosting and compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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 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://explosivedevices.ru/media/file/34362555728.pdf In PDF document text
    • https://kingdomdatesuae.com/userfiles/files/8179835825.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/korubezawaja.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/a621a3c6cda52bf573fbb63e0953e719/88481134970.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/daboxe.pdfIn PDF document text
    • http://vodova51-53.cz/files/9709769649.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/muxuxa.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133b0c4621b8---16424436634.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/66275976481.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/92280394977.pdfIn PDF document text
    • https://estoniapools.com/contents/files/63518816030.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f3e1e94e0---bofexurupa.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/zusunawusetarukekoresep.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/458aba35433286faa15dd6efe374429c/dekewetesu.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/56099009451.pdfIn PDF document text
    • https://polaria.cz/images/file/30674340246.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/zonuwototadiwize.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/24256011664.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/jipolofereligodanu.pdfIn PDF document text
    • https://zzwgjx.com/d/files/gifeb.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4969463d---94832217573.pdfIn PDF document text
    • https://webmenuplus.com/images/file/wovujaripufevunolezazero.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/tobozopevopibop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=watch+free+football+on+pcPDF 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_off0000c781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC781 10448 bytes
SHA-256: f4295d9cfd629775815822c83a72345421b7bf2212a62c52183012811ad209e2
font_01_sfnt_off0000def8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 17720 bytes
SHA-256: c788dd3ae4ff9851e2f9e029c712041fb519a7b7cd632b38a5c536e4a0bb05f7

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