Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f98bbfd9db002ed…

MALICIOUS

PDF

72.3 KB Created: 2021-09-02 17:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d7614e419e0fce6122d29157f412fc2e SHA-1: f30f9f5f8950e13347cbdf2a372d5e767bbf7581 SHA-256: 2f98bbfd9db002ed442bdb8729ee496ea9c5b7557f199b8fd0ed4074dc36ac58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://chptravel.ir/data/file/totode.pdf In PDF document text
    • https://boyanbolyarski.com/userfiles/file/sofanim.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109022123476184.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f21598034---ritazi.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/85a3b2d18263018476383cbf214ed993/62836511129.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/tuwesapekuje.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096605286379---50905811724.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/damejuto.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/rurowutagoka.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608143d165335---tozezizexo.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121c5ebdb316---tufumesonibi.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b214dda00c---66869609830.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/juxemagusar.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/ramol.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/83603911279.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2f4d44c5a4---juwop.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/70223638841.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160832f57bed4d---239526618.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/ebb869073add1a7fa8cb9b221f90a57c/bekedogalunapugor.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/sutonewexogapaka.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/58091318289.pdfIn PDF document text
    • https://gangnampools.com/contents/files/xodisa.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/20032187297.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/lvucj42ioj21qv0vm0sne99i7d/bisekexizuriduvesonav.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/qcdss85cuflaqeqlp0vcdi3du7/xawomoxidoxinuzetebedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=russell+norvig+inteligencia+artificial+un+enfoque+moderno+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_off0000ba3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3D 15584 bytes
SHA-256: 5f5fd950ed91d4433c14a30856e052658c2d28da7272e184d464d89d98c76a85
font_01_sfnt_off0000e089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A0 11320 bytes
SHA-256: 5455e984dfb89471f3bc9a3569725bfef30630ecd3ea3032bd8a0dc00b5bddad

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