Malicious PDF — malware analysis report

Static analysis result for SHA-256 a379d05289bb110a…

MALICIOUS

PDF

80.1 KB Created: 2021-08-26 10:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6acca028d2976019b10cf1637bd5e7df SHA-1: b936edcd2abe877d6dcd3ade7069f6718fca074b SHA-256: a379d05289bb110a1d11ca375ab8b3ac5622aa43775d6dbafd28596202774958
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users through multiple compromised WordPress sites. The embedded URLs are likely part of a phishing or malware distribution chain, aiming to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/fupkt51ioikhm0mjj57mj2s7b3/todivoje.pdf In PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/9qe34ntqlf5nkm2a10iiglo2h5/59954439155.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/demeribago.pdfIn PDF document text
    • http://clarasonic.com/upload/file/54740953090.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/gozapuvuroran.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e03b257f7e---watigafu.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210726000828.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078b78b13009---78339935449.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/jutasuf.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/9820559314.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/41590721689.pdfIn PDF document text
    • https://beaszemin.com/files/81095332763.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609782fb15efc---dijatexodanuvep.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c787647b56---75822515816.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tazin.pdfIn PDF document text
    • https://people11people.gr/uploads/File/63129890283.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/bipororijex.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/faxalamanojoxid.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/kukaxovededirujosep.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/nasorilifew.pdfIn PDF document text
    • http://aps-mes.com/files/file/soterimugaxodoxefoxetojol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=india+cements+limitedPDF 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_off0000cf15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72C 10260 bytes
SHA-256: debce9541f316692157d1aa4ff8a0f3f9f5b7df6e9a287b9770b919495ccdbaf
font_02_sfnt_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 20900 bytes
SHA-256: 73348052a0e3dea3d3af43bdcd93a236199621f75e271a8560c9dfeefa8f6ce1