Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf22def154353c7…

MALICIOUS

PDF

72.3 KB Created: 2021-09-06 17:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b40cf35b27269f18c50161f03d031e0f SHA-1: de69529db98ddcfd4dc44f852fbd90bf313b6ecd SHA-256: faf22def154353c727430b8408f782e710df80c662f180f0f69892fd022c8ff7
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links to websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://broadgatecapital.com/userfiles/file/mivigidiwafebamo.pdf In PDF document text
    • https://mygo.com/ckfinder/userfiles/files/pozivivo.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160768fa9275e5---48063427698.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/sujodutelo.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/35087945457.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/xufuselarokis.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/73f35dd5b261d022cf3b0de519346913/76658711335.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16119c84ae39d2---61492023308.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4aada44517---vogojotoboboritakugeded.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/a4e1rlknjt28lr6r4goc1ffkl3/34599036299.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/75553944861.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/nekidefanixupa.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/57151276686.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f94d6c81c6a---49680140977.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/96064654365.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/pezefamatov.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/31214425681.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dep9kqe793bcj6olqsg1g6e234/mimefebodid.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/62577450200.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/14481199298.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/b4fd57226ecc4866f5cb648a17e2ee69/43880095220.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/16245859699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=libreoffice+writer+pdf+downloadPDF 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_off0000b4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDC 18204 bytes
SHA-256: 33e38d7caa0c2b1a14f544e361bf1f491721ba571e675679c69128001ba1032e
font_02_sfnt_off0000fb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB28 10628 bytes
SHA-256: ae56163f40fa6568ec67d7720734d5e88231ce9acc675bf9fd3081e4b0a522de

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