Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f14e17b93809e8…

MALICIOUS

PDF

85.3 KB Created: 2021-08-06 23:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 624a78a9f0b952633435a6326a226b9d SHA-1: 38d9a1b8cbc84acac060d0a303cea65b132d5a0e SHA-256: 37f14e17b93809e8d045dea9d69f34c5c6fbc8b9d5b84eb25e08d93e41353606
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://alnahamgroup.com/userfiles/file/4167025096.pdf In PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/gitomexikenuteganemani.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/49756551263.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/0c2c311c0f8d6c6bc4e5460a6dc73d5e/48690883119.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/898b620748b0c64eca484e226e76e355/rilujefupezetidufulop.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8da5a62a03---5361143702.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/b6d8c97dcecc458c0eba4104bde028ab/43332270511.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16104a85d7221b---taxerak.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021062907414973499.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/4c91e4c9a7b96f018d44bcdf6e22169f/96363832994.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/kiwikiredikas.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/18ee94574d6081d6947aa44784f878a9/32143073092.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/mitusox.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/ff0dcf854df4d8ff44c18904487aa602/makofudeluk.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c9c2b497f---12994148506.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2ba7834d2---kijodi.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/jijepobavewosesure.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/ae32792cd4ce84b58796b6664ed51c39/nofaxejirugugufowu.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9541e710f---tewunosazesomamixigimafaf.pdfIn PDF document text
    • http://gtshotel.it/images/file/gijanaserutixulusiv.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/37143865743.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/t7lgq97ogqf177tik6rapgk89i/71733362900.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/1195e3ede7ab31fe6dd6374838468c6a/62895627776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+much+is+lg+plasma+tv+in+nigeriaPDF 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_off0000e909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001011b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 16996 bytes
SHA-256: 01baa52a104dd9af47f6c9a6dca1ba9d482e235b7d4f236f77ea4f80c37a8ea4
font_02_sfnt_off00012d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D76 11064 bytes
SHA-256: f5dd59dcd6b0d190992f3cdcaea8368ac08c922c7d5a9ea34d00057951360050

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