Malicious PDF — malware analysis report

Static analysis result for SHA-256 47a51bc2ad61c6a9…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 15:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e4c3870739538b96e12716751bb8597e SHA-1: d5632a9ee77d538134125418d99c83ecc7ef27bc SHA-256: 47a51bc2ad61c6a9f1779d3257c0fb10f2f628df1904e119ae8e772ad3f975ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://elistaprezentow.pl/userfiles/file/56983085296.pdf In PDF document text
    • http://etabetasurvey.com/userfiles/files/82779456574.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/juwoxi.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/werodu.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/27823339209.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/82929136856.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/nidofal.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/89788319608.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/8423880115.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/zixunefudel.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/69970374309.pdfIn PDF document text
    • http://newmob.it/userfiles/files/88764643388.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210917155201.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/6efd6c4870b084b2b0b5df8a3628f03a/sabalusopogizegoruba.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/lovuvipesosamosuxizovet.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/sopitemod.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357a8af383f---nodiruxebifafolumim.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/xipivubuk.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f440dc602b---9275326092.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/wemavitefa.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/xodukoz.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/13290974429.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/20778773635.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/xifagixofamimufaxav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=tango+live+mod+apkPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/46731153778.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_off0000d82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82B 20304 bytes
SHA-256: 07a750dbc48a1a2a0f4e4d8d4b49da4bfa9194be103cbaabe1d98471f528ab84
font_01_sfnt_off00010d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D38 10488 bytes
SHA-256: a3aa6971c5f25d66bd1f24a92de0cfb7647512b2b5a97055a291d6e6277d76cc
font_02_sfnt_off000124cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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