Malicious PDF — malware analysis report

Static analysis result for SHA-256 3abf6bc18b0c9232…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 21:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b60806069a6204c8428b4f94b369e322 SHA-1: 9642e866819c757f1f4b724f0b31dff6722d556f SHA-256: 3abf6bc18b0c92327ebbf87372e94de2a2246c1784d48e9d7c9233f2c386ab4e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to multiple domains, including compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support a phishing or scam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://maria-galland.ru/files/file/81879575912.pdf In PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/7319964683.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/6175150879.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/pofiwikifovipuwopab.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ab50844af---zokotogabozati.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/ruzabemor.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec2c6d9011---xobabibulejijome.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/milenox.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/zizakedupisoz.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/cc47082ef508561ee53850c92246ea84/tabazuwuvusebafufew.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/godudetuf.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/gudamufexixepozoziwesatot.pdfIn PDF document text
    • https://coil.hk/upload/files/xefojediwa.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/63651183804.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10126458361.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/nuxepepiturukilokexe.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/sagojekika.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/konurojipadonubanu.pdfIn PDF document text
    • https://majubesar.net/contents/files/84101151296.pdfIn PDF document text
    • https://panama4d.com/contents/files/gexelizejimuromusi.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/datugogolakata.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/64573193745.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/dalolaxejapipaxa.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/pegetewokom.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/20087901214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sweech+wifi+file+transfer+for+pcPDF 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_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 10736 bytes
SHA-256: e1e0fd3e0351ec7bc82f6aeb2f2f7758ded3fbe096e77b20b348cc64d7e9c2be
font_01_sfnt_off0000f837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 18104 bytes
SHA-256: b4b4dad64a5a4b4164db76b108aa8e430c07ce29caf116e7371bfd617b4a42d9
font_02_sfnt_off000126dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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