Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da32c4ce9da12cc…

MALICIOUS

PDF

84.3 KB Created: 2021-09-08 21:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 95588c1e1da018bf02d7bd82d0655d59 SHA-1: 5c5ba14474090ec052680fedacc429b30096bd85 SHA-256: 3da32c4ce9da12cc455aec80809d35dbf820da290e2919ba51ec0d70a9957775
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/uplcv?utm_term=nremt+paramedic+study+guide+pdf PDF link annotation
    • http://belgium-ex.com/images/blog/file/fapetesaze.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/gebefuvosotuxaxop.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/jegixunizulogubogujufike.pdfIn PDF document text
    • http://flomojapan.com/upload/files/55279910598.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384f907d1db---29200573825.pdfIn PDF document text
    • http://specialcats.nl/media/files/satuwewamokibubom.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/56870752774.pdfIn PDF document text
    • http://gapp.fr/medias/files/19186679049.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/40703397998.pdfIn PDF document text
    • http://belovosushi.ru/files/73868040408.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/98835936788.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/73053133741.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/toxazijaronexetimo.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/58506189916.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/simawi.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd4619aad6---migumurapegavew.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161384a45869b7---wibibafivipuwufafalonojep.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/23968044709.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/25057570371.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/47235683245.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/bebaxosikunavi.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/96086211416.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_off0000e4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AC 10884 bytes
SHA-256: bd40b95a130fc6c4e1349fd26db2c0b2173091f456a6b39984ff8317768c4a38
font_01_sfnt_off0000fdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CD 17704 bytes
SHA-256: 53df971414b3b12dcbcda9621e396ebef3d41be99c731a199740860a686e3746