Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade6c352e8faea80…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 18:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 77deec2dc818f8239f5e25b8525b6956 SHA-1: cc6257222bf4944eb77c8ce595a7b5e5a276d407 SHA-256: ade6c352e8faea80bbbfa790e32eb8564d99698e51d5afa833e23f1603ce8a6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=love+chat+mod+apk PDF link annotation
    • https://artesapanaderia.xyz/aym_image/files/39678161429.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/91339588638.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/llngrfdau9vjmtr3qldk3m825d/tavod.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/b3cf152e3ba9510d4d15f7285c20d764/79789468902.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/viduliwofemu.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/75735880552.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/kodagi.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/jawofelifi.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/narivoril.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/fubiguzovubuvumeke.pdfIn PDF document text
    • https://brod-plovdiv.com/images/36946816199.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/27957459835.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/tolupinexemipovolu.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210905105030.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/86888328399.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/gukilizebazovevotute.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/ligivolofusudadiligulu.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe89084ef5---19927133945.pdfIn PDF document text
    • https://maria-galland.ru/files/file/28369911862.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/51554960846.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf9e0a9b9f---bimopamo.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/pusepisigumezuwamamixigub.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aafc47bb3f---nimefegepop.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/wolanuzeno.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_off0000d9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 19720 bytes
SHA-256: 9670d962d2c65d277b7117f886721d7ba07b641ef0f6dcd90df7773a2a9641f4
font_01_sfnt_off00010dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCA 10384 bytes
SHA-256: c7c32ac71dd455e952a3d5d5e9f3ba7df781a97284ff554c215bfdc9673f444c
font_02_sfnt_off00012556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12556 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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