Malicious PDF — malware analysis report

Static analysis result for SHA-256 34adae7bdfe9b6c9…

MALICIOUS

PDF

87.2 KB Created: 2021-09-16 12:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b412ec29ab0575fa860131bf4043d67 SHA-1: e2446dbf1f9e46b0ad8e6f5a06311b3c85320256 SHA-256: 34adae7bdfe9b6c96bc9e29ce761e7d28ffae5ef9bb831c1690c3b4c42044b17
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on potentially disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the presence of a link farm and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://acril.ru/ufiles/files/xegaxerijerolasagonu.pdf In PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/62160008653.pdfIn PDF document text
    • http://novafish.it/userfiles/files/85324534158.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/2171704924.pdfIn PDF document text
    • http://centronegozi.com/public/90150248158.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/909178527.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/tugirelijirazadoxuw.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/21114716199.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/13885289500.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/63832848907.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da65d724cd---pixebogoxomutegivawofove.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/92291795072.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/89145123822.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/33694385089.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133f0481122e---mewejafusijokok.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/futod.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/nugetijamejivividuvoti.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/xegilebebijim.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/riguzopupofidukar.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/nogitinoratafupufi.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b000ee4bb8---15143598882.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/mowexomadipukudakokeju.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/84516488802.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/9307293267.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/mijotinafuguliz.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/kavodimubakemexiwaguw.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/farigidotoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+can+i+transfer+data+from+android+to+androidPDF 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_off0000f15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15A 17416 bytes
SHA-256: 526844463e7e5a783cdf3c14830403b06905e919cd38c34953124d4f75e3c13d
font_01_sfnt_off00011e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5E 10668 bytes
SHA-256: 5f0bcef05d304ca0341c69f1f46cbdffa1447cbbd390b12bd837bbf35b11190a
font_02_sfnt_off000136dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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