Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f50f84c5cb941de…

MALICIOUS

PDF

76.6 KB Created: 2021-09-01 19:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4b1f8cc5b46fe6761e4d2e7434b26d1d SHA-1: 480dff50ce78ac48ae8baccef7ba7875aae2c373 SHA-256: 5f50f84c5cb941decee6503c38e49ad98dbe2595e6b5378937a1582d31ff32f4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f68911e0a6c---rofisefivagixoresilovitir.pdf In PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081c2336bc33---savevinupodopoko.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/6rjo2gbsp6u8krl5e5hllj198h/13515919658.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/24be7525984aeb85fb19afb244f96de1/depupurudixame.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/98360559095.pdfIn PDF document text
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/desasaxeli.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/91143569931.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/buwubaxukozoz.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/68183260112.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/qphhkhc0avel7tf3ibj3ul8vk0/80677698390.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/48539663069.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ee5921836---kobejotinedeweveropuve.pdfIn PDF document text
    • https://cochleartudaskozpont.hufiles/totewiso.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/156ea39a9e0c2bfd5e747916371e3d1e/bivudika.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/75711069945.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4e8f66e99---48317134764.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/h3cqnro3qkpkhm2kecq6m24i0h/gufolubo.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/ec361a56c1fd745a866aca4c8386d517/nitikotulowupagaw.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/56977496215.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ca6356055---77909655356.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/diwerojana.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/39768355861.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/zuwali.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160bfccb60ab86---65428633576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=euphemisms+for+one+night+standPDF 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_off0000c853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC853 10984 bytes
SHA-256: ef6147a542e022018132cf58a949c528f81031e1256afd596a47608020497059
font_01_sfnt_off0000e16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 16500 bytes
SHA-256: ff8d0f29e6b0345f080c070c158910f5ddf67040ba0e4043e97fd87d23090d7e