Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc13e4371d99bf07…

MALICIOUS

PDF

78.4 KB Created: 2021-07-02 21:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 50743776dc5923b55c0f6da6db22eae2 SHA-1: 649f5606e79dc77695ce2699ecf185ab99c0fb2b SHA-256: cc13e4371d99bf074482b61ee9dd0589b655ac04a650a7d9ca85821882e6fd4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=hopefully+meaning+in+english PDF link annotation
    • http://www.ecostroyservis.ru/File/metusizemulazex.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/igiqf2k5icl908b8ee242vnmq3/279896744.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/rtf689p4eicfkmfdc88fi1gvmf/24670013704.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/46972140419.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/8v7np7k6nd2n17d3rvvsduhjuq/gawumumipezepu.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081184608890---49637951382.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/40412214398.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac814f3beec---25888730074.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/7lboab21b48ilhpqslv1hjp4hf/36245751118.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a6f388a02---6682577410.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/385b53e18e69b35a6176e5329fbd91b3/70102438585.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/5890668311.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9e747fb91---duwuwokixaloponatute.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fba3ef1eb---posetarapizoperuzuwagurik.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/61345904521.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/71064641291.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/64c3c558410b566ef85f13fba808cf70/75778151457.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/34632099511.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/iq1mbvpkabgs15que1pf25lbeo/52724746660.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/059a01e5569d40476ac9752bd3b2de35/tekorofipofijirujekakow.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/5593112326.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_off0000cb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB17 10812 bytes
SHA-256: 4cb3b26a3f1f2a78f341d33b93dd9707c0d7cf593797ecf16d7af489127110a7
font_01_sfnt_off0000e3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 18932 bytes
SHA-256: a79b65f5131fabeeb992821393b66689168effd89970bc98193073cd9084332b
font_02_sfnt_off00011491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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