Malicious PDF — malware analysis report

Static analysis result for SHA-256 999f5d4fd391b9e7…

MALICIOUS

PDF

86.5 KB Created: 2021-07-18 18:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 39d3d3cb2aed257fc2a2713ddd61c39a SHA-1: c89e1f51d4ac144a9d0e37c4b6f768f58000d028 SHA-256: 999f5d4fd391b9e77bb011cc1aa59baa7c11696a69cc56225de0195bf014fdb0
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites hosting other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these linked documents. The presence of a link farm on disposable hosting further supports this malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c37bf3103b9---sulajasuwewebi.pdf In PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/55be00af2c6d26cc6bb33782172088f9/jovutituxaperuj.pdfIn PDF document text
    • http://policylic.com/uploads/files/vamukiderafem.pdfIn PDF document text
    • http://congtyvima.com/images/Download/jewevitetuzukegapuji.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/jopubewadisadujaj.pdfIn PDF document text
    • http://teraval.cz/res/file/manunevo.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/53110216966.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec523f45002---temizinovomeronavine.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c6784ca7---13345310235.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/tjfou7fiag3ilmviocatuhm23a/83955287494.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/63710118402.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609410da7d44c---pafefuw.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/00d71978bfa9cb0f1e6b0bf5b050dd85/68546219276.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840691336b5---12923868307.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/aulbofqfvqfvpgob62gk5nomai/mixelokedo.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/88718067206.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e4cf581b3a249fde6944d2f80c2da53d/26582644210.pdfIn PDF document text
    • https://guijek.com/userfiles/file/gisovifapuzudilajanasupu.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/zivigerosadevapaxuve.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/pepefuxuwotexidomisab.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/sidedarudubawuxakenukerun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+does+demigirl+and+demiboy+meanPDF 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_off0000ec7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 10944 bytes
SHA-256: 4bd885ecac2db325ca4c2bb6ab768023509489427f61ad590c59ede758388b67
font_02_sfnt_off00011d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D87 17524 bytes
SHA-256: 225648e29bcc4512bf61ce89263c3f55960beef81bbc29c9faab771df85d6ad8

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