Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04f032463eda65b…

MALICIOUS

PDF

82.5 KB Created: 2021-08-28 13:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a442e8ed231f09629cd43e192fc2ee57 SHA-1: 472dee80937c7b70381492f6ea3e07bfb589de31 SHA-256: a04f032463eda65bea3c46e86dfcb6a67870bba3080316809d6bdd07f4b7ee98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The 'SE_INVOICE_LURE' heuristic suggests the document may be attempting to impersonate an invoice or payment request to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://sugarfree-gelato.com/upload/file/93457245094.pdf In PDF document text
    • https://hunghiephuylog.com/upload/files/matigi.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/simerujin.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa79e4e7889---62063034054.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/2l1mtkkf5jqltsril7euuk62d4/14973213443.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a97986d85---40540445330.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/mcm00a5hns1lcmgsoko6tm6t8p/vugekodagoninosupufebevam.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/53786866100.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/345berokgmbtqi1liat2l5uf50/28518434744.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/padinafok.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/5lu5ru7n97mvndbb6u1d6ve66v/11273011710.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/pumigufezafogigibiwa.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/e0359348f1ceeb0f2fec71c50d9e7b6c/dalinedesi.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608263b8645a5---refevedimutinemod.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/wemumek.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/todivumaretutisaberixav.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffb42032ae---50694996721.pdfIn PDF document text
    • http://midel.me/userfiles/file/82299596253.pdfIn PDF document text
    • http://newmanclassof1965.com/clients/4/4a/4a7b3a1a0fb21659e68ac19badabb541/File/sapumugutada.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/33357842997.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///43756856244.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/xifagabex.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/5e7ql655547jb0c01n47d2kb27/bogetab.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/11673887685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=overcome+obstacles+synonymPDF 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_off0000de0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 17752 bytes
SHA-256: f164a6e6e371b9fff87223e5531d627d5bc757c4c2ba30870e3ade04269c1c21
font_01_sfnt_off00010c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12475 10644 bytes
SHA-256: c525e2ba9f2b3c3ed832752f25561e6bf9e88d17f855fc519d66a9f53f2b54ee

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