Malicious PDF — malware analysis report

Static analysis result for SHA-256 103d9cd34a4d47c1…

MALICIOUS

PDF

82.5 KB Created: 2021-09-15 00:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4dbd7a9c9dff846e885a3001f4a2b2e0 SHA-1: f942e835f183b8da10aff2bbc7c7cf170b262595 SHA-256: 103d9cd34a4d47c19e766ef19a9e223b0cf8b65b932a9630530600fb129bb333
156 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 ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, potentially leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://oniceh.ru/uplcv?utm_term=six+thinking+hats+full+book+pdf+free+download PDF link annotation
    • http://orthopediedelft.eu/files/muwitakifake.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/60917645102.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/bf9r686jp9g3b9f3qbc1appic2/vanabarudilegilereta.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/24429265828.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/47295578295.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/vuzewezibimagevotibuzal.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/bc8acda3fcaf1b784306b159a0e65aab/vovilu.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/9953140848.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/xijanebovolikawamen.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/jijiforokilomikoj.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/6b218a781160c93a71f474823c2eadef/86429926309.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161410e445b50e---pojojewumit.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161410db86f182---19583290158.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/puxazerodunojuta.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/36114914467.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/sefapuw.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614087ce61846---21141315691.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/puxiko.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/81048645350.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/32672303738.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/79624553527.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/84069594041.pdfIn PDF document text
    • http://ruihuitax.com/files/file/43228766578.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/46963604561.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/44008456771.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/35173097294.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_off0000dd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD71 16928 bytes
SHA-256: ab917556ab4278fc56493680d3e28c10ce73459dd977e154a93148fa4c9b2483
font_01_sfnt_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 11372 bytes
SHA-256: cbfc40879cfa905c63f5ba46fc08509f171ed11164cd7e84ecae79d495212c3b
font_02_sfnt_off0001234e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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