Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7bdf225f646360…

MALICIOUS

PDF

71.0 KB Created: 2021-09-29 05:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 010c0b7f18b708439b185e95a287c7e6 SHA-1: 12cc98f81860e95a1c64326c08856c958f258b65 SHA-256: 6b7bdf225f6463600eb03a8092cbc9da6d7b5dd72c2702d683dd6e4bae535d89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous external URLs, many pointing to compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links, some hosted on compromised CMS uploads, suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.tahitotfalu.hu/ckfinder/userfiles/files/65540952503.pdf In PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/tidabidifudazaradodemoze.pdfIn PDF document text
    • http://cartopack.com/Images/file/69608252598.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/fusuwibutenuvovirezes.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/29693036594.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/pevubejid.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/461ca0ef9575f3d6a63980788ee5a444/kunusojuxosufixa.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/didasegodadezesokoba.pdfIn PDF document text
    • http://netflor.pl/upload/File/levesodurikij.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/notosilopalo.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/66554819464.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/gavoxago.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/58071039723.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/49813778449.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/35724199592.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/gexusaserasasebosirol.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/bia8p4ierbq0v9p16avqcdcnv1/kigaxut.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/43909851291.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210929071624.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/1968365990.pdfIn PDF document text
    • https://strechybenesov.cz/content/65593977278.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1ca98bfbd---37489352818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=crazy+games+76PDF 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_off0000b3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CD 16828 bytes
SHA-256: 47daf0dba870da9c01a52e67b3e07a1e461d1efec68a0bac9dad6c8736522506
font_01_sfnt_off0000dee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 10412 bytes
SHA-256: 50523ceca24b05e60ce07c3cb6261de6595d33bf2afd6d0583cdecdbaf17715c