Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45c69e02853914d…

MALICIOUS

PDF

96.7 KB Created: 2021-08-05 17:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c2622be643794be403e8ea720bc731af SHA-1: 50b77fa962dacdd880a5ec9f2456fb51eeaf6bcb SHA-256: b45c69e02853914d7b34812adabd6cdad8071e366b510e884a4c1c3195fa40c3
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/h42u70pkoilcrvnm6hh2p6h9ql/25643046150.pdf In PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/28790927585.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/81776880615.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161097d0c142e7---dadobugalarunis.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/tawufupumasamanukovuriwek.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f5e738dd1---fagukomejosozew.pdfIn PDF document text
    • https://people11people.gr/uploads/File/77266240139.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/b1c2d8a9cd5d944b61cfb9297598b588/sakodesubudi.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6167873cd---kinotudatukugekuxavu.pdfIn PDF document text
    • https://pecsikult.hu/files/file/gevegesumuwavudan.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/8c3d3a32a47bc9494e1f24b86099bf1b/jidesokuduwazok.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/08/202108041642538371.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/mtp6olq2gdc12mu5u7pmnf55g0/bonatufovirupomoraminodi.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/58192129092.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/talufoziwagajonemira.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/vaviwuvipozagifif.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/watibomebav.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/13c889f5868ddb651b6f3d673c86255e/55599273846.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/28578636613.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8a9d7d45---95340871602.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/jenupexilodekesizuwokep.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/pugajuza.pdfIn PDF document text
    • https://designclarf.it/file/pivejosutar.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3feb35197c---posejozawad.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841d6dd8d44---51991855619.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/dizizifegogevas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=30+day+keto+cleanse+resultsPDF 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_off0001140d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140D 17864 bytes
SHA-256: ab4338d04e13d07a30642782b94c3fb7226291fe45371fe544b6755b970f6441
font_01_sfnt_off00014306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14306 10772 bytes
SHA-256: 4b6ba7403b2893b44a0084551b6d1d88302e3b46f8caa7fadbd7ec6851ea75d6
font_02_sfnt_off00015c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1