Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5560b06fc68fb4…

MALICIOUS

PDF

88.4 KB Created: 2021-09-18 18:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e52c9e20423062356032ffea19ce2528 SHA-1: 4404d5076e19bec4d01fda24615ab88ee88fa282 SHA-256: cf5560b06fc68fb496d4727502ed40302137789863f9311826bc07744521cc4a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, directing users to various URLs that host other PDF files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely provides instructions to open a password-protected archive, a common tactic to bypass gateway security. The presence of multiple links on compromised WordPress sites and disposable hosting suggests an attempt to distribute malicious content disguised as legitimate files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://sloplast.com/userfiles/files/lanapikamaguvelowarire.pdf In PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/xakijuwo.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/ravipepumug.pdfIn PDF document text
    • http://leeandrewdavison.com/download/sidejugasixobojowazid.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/20726cb595b7d8a8cd69e8c8e46ecfa9/40690854030.pdfIn PDF document text
    • https://kar360.com/resimler/files/lixonekaripuvonubim.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/39377059533.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/46nfu82slho9ga31g5oitf24um/sukefifuguxojulabevoxatof.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ad4c7d6dc21c9972136bf2ff781aaad4/23726906170.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/82075816133.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/ritepanufaximi.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/wawesemomix.pdfIn PDF document text
    • http://balalajka.nu/media/gifaviwusuluf.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae41f132b2---xudazat.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/da17eaddba58070f60dfd7d13c14ce2e/xelaxebo.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/jugutinupowotefixabimu.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/guzakuroxag.pdfIn PDF document text
    • http://temdientu.vn/images/ckeditor/files/gizulowuzotufefupunixilut.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161413879ab6b7---vupujoxudabiseronitowujef.pdfIn PDF document text
    • http://52963566.com/upload/file/202109162151354527.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426d60247a6---90046025161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=compartir+archivos+por+bluetooth+androidPDF 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_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 11116 bytes
SHA-256: d2a1f4bc935f1afd3d9eccf81f66291a3c36eac327e0a72b31c9345d9c93b71b
font_01_sfnt_off00010c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C70 18796 bytes
SHA-256: af5b6fe1ffc5ddd0130723015cf043333136701a1b5a323b0718981407943b01
font_02_sfnt_off00013c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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