Malicious PDF — malware analysis report

Static analysis result for SHA-256 572dd2efdbf750bd…

MALICIOUS

PDF

127.2 KB Created: 2021-09-08 08:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0c3e268f8051a7e950887bae184366c2 SHA-1: f22a774b324a85ccf01ef532974e91b329a07a1c SHA-256: 572dd2efdbf750bdd39c3e2ee0710e4cfec63d1c4a776c4c6336949e3106cc85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs, many pointing to disposable hosting or compromised CMS uploads, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://tyko.pl/userfiles/file/52288201433.pdf In PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/pusotoduzexitefananekab.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/sigidurikok.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/87581875923.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99ad29c96---46575837573.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/jojugid.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c83ce4e12c72a6bf25348b2f6e1009e2/7535062395.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/petefugizegopusikopinigox.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/39894769790.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/labuxavefemojedu.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607121b0519f2---guwinipazelirodaj.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7476b36878869917209b456c3ab2f36a/gorumal.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/gasujuketamuselokogepudal.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/p51jlblequsv37c6cv1oji91h7/xobav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=modul+mekanika+tanah+1+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19046 18528 bytes
SHA-256: a345aa03fe671d0d28e53074649d0f294ff6d745b946a2b3fc990d968d5d697b
font_02_sfnt_off0001c0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0F6 16188 bytes
SHA-256: cff13d2b7e8e832183d48191555c2f6cc6e1e9ee2bb427d40ea948c48fde5423
font_03_sfnt_off0001d6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6A7 10732 bytes
SHA-256: 25c773361a2dfc4e166960a153a17ac6867ce1686c49d192a420239f2da3f64e

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