Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20434df682450a3…

MALICIOUS

PDF

59.5 KB Created: 2021-10-01 17:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 30574571fc70760c157844a580932b45 SHA-1: 4dc0eddb50f1c4fd2bc0a44b7e61698c27aa130b SHA-256: b20434df682450a38f2704b40eff000c637a163ecf9e3d45dc7c0da8385aba50
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, a common technique for distributing phishing content or redirecting users to malware download sites. Heuristics indicate these links are hosted on disposable or compromised domains, increasing the likelihood of malicious intent. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7225

Heuristics 5

  • 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
  • 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://emekyesiltepe.net/images_upload/files/47382152937.pdf In PDF document text
    • https://watertorens.nl/userfiles/file/tezub.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/59464481253.pdfIn PDF document text
    • http://888chji.com/userfiles/files/48263492699.pdfIn PDF document text
    • http://polipack.ru/content/file/69846135985.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/75599412468.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202196347503663.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/13256432298.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/dowivibufuvik.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/89948376873.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/wigagoseve.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/2823735586.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/butivorusenexoranolej.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/zepafalefijale.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/61531349793.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615267f7ba92b---75557152887.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/16637476361.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161439825e2bdc---fumenisevojokiwifolewi.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/1657964820.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/fetavozuzubifetofi.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/waduwodo.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/17288054023.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613394e4449ef---57362198718.pdfIn PDF document text
    • https://cityface.cz/res/file/simuzidibuzilemixebo.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/vojunoful.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pokemon+leaf+green+guide+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB370 15064 bytes
SHA-256: 2f2f2db7346b7cdd01a1c5c97752ea5b67885b04771ecc9731497ade07758cab
font_01_sfnt_off0000d902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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