Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6e513d408c8f4d…

MALICIOUS

PDF

74.5 KB Created: 2021-09-06 17:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b1f27f25c4301db86112cc6b770b5e10 SHA-1: e31e954fb8e8276476d68ae7f6e2790d905abbe9 SHA-256: dc6e513d408c8f4da22360e79f2a04bc151a55f31f2c6c1d3b17739331f24646
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://1careglobal.com/upload/files/91628702054.pdf In PDF document text
    • http://www.klimavill.com//data/editorfile/zegukazi.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/jedifimema.pdfIn PDF document text
    • http://tai-group.com/upload/files/lanavito.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/fitupigeraxowunemafazafu.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160768fbac8f14---74690509951.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/gufafofemilolededusu.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39cad81873---lunizenegisu.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/kobivojumazex.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072155062ba5---kelisezo.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3e6efce3889f32aac2ff56040642e157/34668184554.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f202c26e14---kokobiwebexonofa.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e22jo4316t68hqhavl4n4dund2/pokobawivejiwovowap.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e46fec8c07---xenupes.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/28538932637.pdfIn PDF document text
    • http://bettekingproductions.com/clients/874300/File/xoxaruzumebev.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/32029748911.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/29686447190.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ao493ekhmvlqh5mv254kpnk0pa/gupebedebuwezuluzuwisal.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee972554d---70540750219.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/denaxixorubuxipos.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/fifakunegofip.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/3311474251.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/349fc3d66ff3016a810fe77417acbe49/natadejarafovozulelanak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=indefinite+and+definite+articles+spanish+worksheetsPDF 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_off0000bdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD8 17428 bytes
SHA-256: 3f24c85b509aaea4d14069f159ef129b18688205cb807b47a319f0ae104ae67a
font_01_sfnt_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 10844 bytes
SHA-256: d72153b28bed545280959a690f4199be9ed32ce766faad3549c02b62bce598f0
font_02_sfnt_off000103eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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