Malicious PDF — malware analysis report

Static analysis result for SHA-256 e872ffd8dc9fb3f5…

MALICIOUS

PDF

96.9 KB Created: 2021-08-01 15:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 43a699361262261365c7d5b46a581304 SHA-1: 2868fd532f603c751b70bc25d103a8a706147b47 SHA-256: e872ffd8dc9fb3f5b9fc737752ba7a48b6221b67c9dfdcf446e2b3c7318dc990
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external resources, many of which are hosted on compromised WordPress sites, suggesting an attempt to distribute malicious files. The presence of a 'download button' heuristic further supports a lure-based attack pattern. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//vexirek.pdf In PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/0bnt1ot5sa5h7nhep3hvva6eu3/61992509327.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/13483196733.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/bomuxulek.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/gifewebopugina.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/tazivamaf.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/klku11scg59jtdqd5lj9lh30h6/nakipefuvopowufufa.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b29461ce05---59851472606.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/famunixovozadax.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae2c34a8bf---muxizigezamesuwoxepek.pdfIn PDF document text
    • http://www.centralperdana.com/file/6558744832.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608db9d897a14---68141405395.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/dapube.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/karudo.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/24836571795.pdfIn PDF document text
    • https://andhimazhai.com/images/files/dimuvezamitanijulore.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08cb80d99---luzusetediwenasija.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607402edd1871---kavoliwafagisomugokiv.pdfIn PDF document text
    • http://wami.cc/data/files/98214631754.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/kujur.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/78df84c33be14d6806766d0f6dc0d427/83692135143.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/2fs40cd8vj989husqislllj1b3/72668357014.pdfIn PDF document text
    • http://brucemaymemorialgolftournament.com/clients/d/d2/d245e0393a5bbb16d67b82808c007790/File/xokumanatawivu.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/19259938554.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/bivorasuruwi.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709a00aa738---berekumowosiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=resident+evil+4+android+gameplay+downloadPDF 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_off00010bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFB 17384 bytes
SHA-256: bd5b7c9f2bb1ce7f54a0ce72db548c4d6fe40d91e26e7279c82c8e80698d622e
font_01_sfnt_off000138ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138ED 11124 bytes
SHA-256: 1ea9f4f8536c6fde38a14eff3dbc729d9dc11abb6859d999c5f9fc01ab2afb91
font_02_sfnt_off000152c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AD6 2264 bytes
SHA-256: e08bba7f5cd594e2a50b3fcbee9bccaed40518ab2e2188aa668288333ef2e603

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