Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d414dfdceaec99b…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 16:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f6ae2b22dc07bda195438a20086bb924 SHA-1: 14f4a5202944c5820fe72fbed9fd14b7bb0abb40 SHA-256: 3d414dfdceaec99bb81a401b5a6422e7684064de31e36f2039a5fe95da004c3f
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 links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://smidgel.ru/uplcv?utm_term=metallica+fade+to+black+tabs+pdf PDF link annotation
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e230756481c---94610674048.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161257dec42eda---pakobumemuvowikubor.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/fesovesorevigir.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/pabojuboxi.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/7be838ea609365d2363dea266f5d8c0a/melolaluwivovozumilarurom.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/nizotanerixowi.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790616857e8---55338779074.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce5232079a---watenewo.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a08cfaeac6b---jerivusanozin.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///35592751588.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/korezefesuwurulalunawojej.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/165b454fb0c865eba97b29d0251e28b4/vofesu.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210527221949.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/52348808437.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/48bc6e574f4d1d1287ce8b84a279a779/20263224733.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/61577287400.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c69f9caf3---guvozin.pdfIn PDF document text
    • http://aweibel.com/Photo/file/pevivivufebogijax.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce96d253b2---zunulisugal.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/99749880670.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/59320805774.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/kebizazapebuwowifosit.pdfIn PDF document text
    • http://henca.com/files/details/file/47877933616.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_off0000d535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD535 16972 bytes
SHA-256: aa9efd7cbb0ed9acfce4bf5cf93f88fbcd98d0218b9347038b3436d57c0736a9
font_01_sfnt_off000100b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C9 10636 bytes
SHA-256: ab9531e8990bb58bce0c77043973441b7518e69bed58ec35bcf04d3a08fd2250