Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f9830f5451a6d0…

MALICIOUS

PDF

95.9 KB Created: 2021-07-03 18:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b7bd2722e9f14f0ad4361c1d1c99231e SHA-1: b7df02c93fed02ca707c6f0eb4220c51dd11f4ca SHA-256: c5f9830f5451a6d00c89ceec6027ad8706ec3f040f25cfd8eadb8bf9a2932e6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised websites and disposable hosting, suggesting an attempt to redirect users to phishing or malware-hosting sites. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=the+light+independent+reactions+producing+sugars PDF link annotation
    • http://nwatchonline.net/userfiles/file/kofewimutimaxuwuvumororaz.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/66a82545a7d215e06fd8aee93a59b2df/zaxojapixilogaxor.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/b5rmvsv70u7vljqisob8bp4s6r/15091976557.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160849b4712b9f---diviworuxituzi.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f354b820---pipekupukenokefe.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/vavopasasitepir.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/1f92d42ea95a83296ba9bfcdd1609482/pukitifufefanebesetepela.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ece113f817---tesubojatixodatepe.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/18002776838.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/jinivagalunoxuriga.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073008797349---ranemumu.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c53cc3aaa5---jikonijituvevefedofowoje.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e2b20d8cb---6279605079.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/wikunosasaweropoful.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/gomugabano.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/2411029438.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8270a9eb20---benugoridamut.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/e54f56164dc5869dfa7189007ac595c5/74697954305.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/rubuzovuros.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/nakuraxananolamawukewo.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1db47332f---30819647741.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/88469339622.pdfIn PDF document text
    • 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_off000112b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACB 17564 bytes
SHA-256: 304c1b10ef1ec2057634207735eca91317ba68fe044addc7962c61c4905aa046
font_02_sfnt_off0001595c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1595C 10856 bytes
SHA-256: c0700a38cd536690b623405f1bf5e188b7bae63e24678f27fe8802da040bca11

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