Malicious PDF — malware analysis report

Static analysis result for SHA-256 8002a529b747c933…

MALICIOUS

PDF

71.6 KB Created: 2021-09-20 07:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a2a1e2a344c30f2edaa6add769f294d8 SHA-1: f9c7d3795d4e5fff96e5e135126fae3d11dca08a SHA-256: 8002a529b747c933e2fb201e14ded2c6b434e9d5b9c3746ab42778eda3f421b1
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of many external links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hrudolf.com/userfiles/82979862756.pdf In PDF document text
    • https://malashealthcare.com/userfiles/files/56318670782.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/xanixafebexoxemaz.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/xoduxufitodenunomadofaje.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/lajuwujodijademakopalimus.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/fitabenabarapavumasujamuk.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/98262792845.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/zewotasoj.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b1901ceb---fofutep.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0a09e76a2---tuwifuzoxaramepulosisol.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/20580587140.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614156254d4e6---63754373874.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/bapiwilulujurug.pdfIn PDF document text
    • http://woykoff.hu/upload/file/67569155124.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/letevazobalozewafenej.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/xiwoxu.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/46008827496.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/84992229348.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/sqdgochu4ae8s8oo1juo2fmcv4/texed.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/062321239562.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/93850837343.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/22396012867.pdfIn PDF document text
    • https://kaparatt.com/images/File/51030195214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=free+photogrammetry+app+for+androidPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/jubok.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_off0000b6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DE 16188 bytes
SHA-256: f30cf56a6ac2354c9847ff197604dc3156950df2c78c862201c9451cd58924f3
font_01_sfnt_off0000e08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A4 10820 bytes
SHA-256: 2bbbcfa349297978812d11b665abd15e7bc876fff7ef28a6fe29e066264a483b

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