Malicious PDF — malware analysis report

Static analysis result for SHA-256 1576c6cbc1f2df84…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 22:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 273e986d63de47dfbef70baf2f2e5013 SHA-1: 1d814ccc7975292ac7626f09e5ef7cc5f47d357e SHA-256: 1576c6cbc1f2df84f750c12c09b7f796327f4f633f8c912c7599130fc4006e97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. It contains numerous links to compromised WordPress sites, suggesting an attempt to host and distribute malicious payloads. The presence of embedded URLs and the nature of the heuristics point towards a phishing lure disguised as a torrent search result, aiming to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118341ad89b4---36282093907.pdf In PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a783a827bd8---78089248035.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/cd0e6ddf3ab4e2784c21a512928e95ae/75422274295.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/tujepodikurilivilefo.pdfIn PDF document text
    • https://parfumzone.ro/files/file/46032404620.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/37592619472.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/megigilinemegixujeda.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608654a41e894---81314500412.pdfIn PDF document text
    • http://ballard1966.com/clients/22636/File/19407673259.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/pewutataritopapumo.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/36281052029.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/jitubupagumesatoda.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d732dc652ea---30479072155.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/rowetudapoleju.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/rejenu.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/f74e9fb335c33857c972f6308e68ee7c/72242313499.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a06528305b---1155378621.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/wudiditipuzazif.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076031fb692e---46092239646.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d356203895---jenupiduzotix.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/bukuva.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/3ce664nrag3k1hh51e1a404us9/zadukizeju.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c010941ea---24898386425.pdfIn PDF document text
    • http://roocenter.ru/upload/file/waresarowonibiduvizuxaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=1337x+torrent+search+enginePDF 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_off0000e929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 10740 bytes
SHA-256: 32cf8d34e8df1b18183924bb39afe13f25eedd1f9580ba4c347a67bd8a8e19b9
font_01_sfnt_off000101ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101ED 17368 bytes
SHA-256: 72a24c81a7c63462c861716e13383bd8b0f20d57f2c287ac7754c952d7361697
font_02_sfnt_off00012f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1