Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c18cac0d3766c7e…

MALICIOUS

PDF

84.4 KB Created: 2021-09-07 17:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b1cba348e1203fe5a40e796e28344d1d SHA-1: 3297c54bb7e30bc67eafd589809f3252db295f71 SHA-256: 0c18cac0d3766c7e198638bf091885c7a9ee7c2af3f5b0284759b9875928a04e
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, with ClamAV specifically identifying it as 'Pdf.Phishing.Trojan'. The primary function appears to be directing users to malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://5uempat.com/contents//files/nifelokabu.pdf In PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/norirotuzobuxobimadilo.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/p60oqv806a6ugg9hsshdcalgn7/vufubalikobapu.pdfIn PDF document text
    • https://photojet.net/userfiles/file/32801644082.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/18713588311.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/001ae1103c4e9d9272859864df34b54a/davutifomabafigolagax.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7edae16c0---11473485012.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/22621494802.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/lejaduv.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4deeedf5c---remigasaxoxiliziv.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/30148087369.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/35c945a290ede4349d22ad13032829d2/70966387034.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/vikomjck8n2dctgs5i7rq87o86/gakijedeg.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/budasubezitobijen.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/20720631641.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/3303466749.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/kivumutulanetur.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/sutofomalepu.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1612f28ea17239---59179440548.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/pegij.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983c0bae12a---45408713842.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16070e51767979---74170955198.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28a618207e---tuvolimiwamal.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/66163301441.pdfIn PDF document text
    • https://mangallagn.com/images/file/66009186517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=psychopathology+disorders+pdfPDF 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_off0000e48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48D 10912 bytes
SHA-256: b2639ca8d924cd35ec4db1c60741816ba0868e3627b8d88f664e0e82ad028541
font_01_sfnt_off0000fdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCF 17908 bytes
SHA-256: b3451f9098e3cca7e9b0c558e6e43eaea2033c4cfaf9f15c99daae958fabb6a1
font_02_sfnt_off00012b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1