Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4d2863373413ff…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 15:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 21a48129b1fbef70dd32aac1af5cb25d SHA-1: ad375b3b10f864ac16f984812eb389b04f505e60 SHA-256: 7c4d2863373413ff284461e21a0817038ac85c61ce57ced4f98c749b68344d7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://akinmedical.com/uploads/file/riginelejenudub.pdf In PDF document text
    • https://istanajp2.com/contents//files/44542058524.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/60118416152.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/2407167248.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/8576636582.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/busedoj.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/40584450267.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a39425f69d---80594871363.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd51cf3d8a---17919725380.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/lotutokiluforo.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/81749220149.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/50830485315.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/1c98d8a11d493f1f5ca2fc5e7ef0e784/letoxif.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/826c3b0d6f326712d58d2d92ee08cfe1/3362015547.pdfIn PDF document text
    • http://lagrupacio.cat/file/wapurosowum.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/benon.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e18e65573---jufedigevurubapetaroz.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/miremoxifedo.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/sitotowa.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/93078664595.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/89081cdd4eab4e4cbe10caa319e2680e/32048888082.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/08929f48532ea54da03abe77d7956e16/judiwomugiben.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=crossbow+mixing+instructionsPDF 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_off0000e21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 17768 bytes
SHA-256: 0f15a4d2b8cdda772ba1e4dd28f419a129129f057e35b6e43fa6a46ca2fe58e0
font_01_sfnt_off00010fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE2 10692 bytes
SHA-256: 6534251739b619dc4c7b114d26828ce842dc1169416f9e1e79ecf77da4cd8f26
font_02_sfnt_off00012884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1