Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a06031102d71cd4…

MALICIOUS

PDF

93.8 KB Created: 2021-09-10 22:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f1342f1bc9ab0c81ed4c134f5e33044a SHA-1: 7165ffdc9abc86043a5a3deb638f3b7c3b4a2654 SHA-256: 3a06031102d71cd4a9a13e6f8c4f4ea29471710183c2c2a7a6c0ccacd99ae49f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous unknown URLs, a common technique for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the conclusion that this document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ukrainski-rosyjski.pl/userfiles/file/32468608515.pdf In PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/jegokilubuzag.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109090033159595.pdfIn PDF document text
    • http://kleiberit.ru/files/file/vinabolonesapalanet.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/21162517905.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/4305627467.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/tebovol.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/26065270685.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d4865c4ab---26481586170.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/59151629705.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/kepimeweguzuwifegapikom.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/0e08174cfed6d756a470c3e67331bca7/witarelerapabuxexijoxis.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/30781271535.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/wikudejesop.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/tovorepofek.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/manowuvotepoxebat.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210902163054726974.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/17166290117.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/beniwural.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wazun.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/69220732468.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/dokokasatapejadeveremesim.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/domikanu.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139da9e24d14---kuwug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sine+graph+explainedPDF 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_off00010808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10808 18816 bytes
SHA-256: 972b41bf329a7981293186b39213dc0db74f5b22182eb961a3fbd705368a5bb4
font_01_sfnt_off000139d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F0 10464 bytes
SHA-256: d60794be2de6b376f5013ec5a2850821c746cc217172843ec9200610e7c6e563

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