Malicious PDF — malware analysis report

Static analysis result for SHA-256 420318597f66ae7c…

MALICIOUS

PDF

69.5 KB Created: 2021-10-03 23:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c6a94df57acf160c912b31324861579e SHA-1: 2b8bf1236ba15616ae1984cd286bc2b032ca3e59 SHA-256: 420318597f66ae7c8c60b696c6c2cb1fb5abe4ee5219c41272ed6dc74d8149ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that function as a link farm, directing users to various external websites. Several heuristics indicate that these links are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=car+parking+multiplayer+mod+android+1 PDF link annotation
    • https://paradigma.bg/uf/file/46997762520.pdfIn PDF document text
    • http://attlas.center/userfiles/file/kipenemoremopiburinujif.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/riwipewizaromimilijila.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/1675263579.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/53326201238.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/71685423004.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/43837346286.pdfIn PDF document text
    • http://hejia-ele.net/upload/85686516954.pdfIn PDF document text
    • https://heyratacademy.ir/file/dubipa.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/xebodetefujujukopodananu.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/47367318791.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136e2eed2ead---gogapejatadur.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ce9394a5d---96861831333.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/78086690917.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/xizuvaxutepefo.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/55908073251.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9e76cdeb6---tejoxujanoguv.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/purawevubamuxediliju.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe9ca29158---vibixekem.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613eef56dbab0---bupuveg.pdfIn PDF document text
    • https://podimercrm.com/img/files/64725488856.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/8783751205.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/93553688677.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_off0000afa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA0 15892 bytes
SHA-256: 76c2ac88a79f12cbe5508d6e8fac5b1307c99e05fee73728d20d7c1e9d8a2d71
font_01_sfnt_off0000d71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71C 10956 bytes
SHA-256: 69a02785dc947478778ab4145405b439632180b3fc943351260aaf77c5638300
font_02_sfnt_off0000f05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1