Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a9ee9bcb23609a…

MALICIOUS

PDF

86.0 KB Created: 2021-09-03 22:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 61571d6d4dd8d3a1665a8117d7ad462b SHA-1: d881a8067e25015ca76aec225c6f78c22f8fff72 SHA-256: 31a9ee9bcb23609a3a49914d62354e46a0ef7a83cf00571003f1684ae12137b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://balajihighfields.in/userfiles/file/naxebisubigomujax.pdf In PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ed2360e93c0---liposukidoduxupipobalef.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/17631843618.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/72c5c16b90063fa1f37324c885caaef1/busawoginoruzug.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/puvanakiluxinuloxufupuli.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7e47e0f5a---nevuwolinuliwu.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/bozetanixuxigofefegixuzox.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/18991018700.pdfIn PDF document text
    • https://pmms-online.com/assets/file/wajapuxomuwuzepif.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608493d9dadca---56200700094.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/36482125684.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/572845339.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/talapanukanulowufexo.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/78993153791.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fc68fd2234b---6977804447.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/srge7u3evhbqdslcjktmnaepgf/zobugefikewewofu.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/83191108373.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/50337439073.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/46400872754.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/760d72e83ed46e634071a6809d7651cb/butemegokadotovira.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/77166993722.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/tiletodaparagolokude.pdfIn PDF document text
    • http://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/10665608290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=2010+chevy+tahoe+manual+pdfPDF 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_off0000e9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F5 11004 bytes
SHA-256: a33d1fe9290ad05240224130e5ff6b8a840d85442fdbd6061c46bf53a57a272a
font_01_sfnt_off0001036d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 17916 bytes
SHA-256: e53ade510cc1d9dcc4583762e77c4d3b83a03db437f8bbe0ce4c60fd610f7ec6
font_02_sfnt_off000131f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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