Malicious PDF — malware analysis report

Static analysis result for SHA-256 6572e30877d0d458…

MALICIOUS

PDF

85.0 KB Created: 2021-08-30 12:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c8446f5a10b0dc4c6d60c6277df85e3e SHA-1: 502223c9d06923d5db4a6574aa1639f43ec2f3a4 SHA-256: 6572e30877d0d458b72e64a168242fbe29cbed9b114ad43fa56271b0dd57c0b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous URLs hosted on compromised CMS platforms and disposable domains. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/uplcv?utm_term=pro+rate+share PDF link annotation
    • https://www.cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/67129236937.pdfIn PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/52413700517.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/11eb9926fd6f57db9e38f0dda2822a2b/70051969427.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/25045230398.pdfIn PDF document text
    • http://talleresjpg.es/img/file/82511734288.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccac6df44a---xisofudupopazakizovus.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/acacb31fe5c14f1bb558f8cc3f41f591/xufifojito.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/5151091942.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/vegixibepopunukiniva.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/kizuludelatu.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec5636b247---wilural.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/siluvezomodefozumutumuk.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/16453147555.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39586048ea---54865020791.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/4f2d873f3bab31e8c33b519971886634/61877195288.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16124899308cf2---kobujipagasek.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/8938842044.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/ketabam.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db3a20b16e---minajuvezojero.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/tisagoradiwepixebani.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/tomofevafikofef.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_off0000e5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EA 9964 bytes
SHA-256: 4d6d0caf385d0443607a6d23ab4a3d67fe0189c81a71e5ec81b5d0ff228169c1
font_01_sfnt_off0000fc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC25 19196 bytes
SHA-256: 24116c0247def6f2cb4c378d4d5276ae43ed09d1ce0f0b35e418822d84dcaaca
font_02_sfnt_off00012e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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