Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4cdb238f5a9e63…

MALICIOUS

PDF

75.2 KB Created: 2021-08-15 03:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: c04290f17ab66b825370cd07b69fc3d7 SHA-1: 8e817cee115f282c4b254b45ed006d0e6ac627fd SHA-256: 8e4cdb238f5a9e631a4ed0ec7df74ecb858d45c260758665e6314f7d4ae43492
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b54963063---87812706003.pdf In PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/93bb5e15ecba1d13dc8d1f3c02ed02cc/sivepemotig.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/5300053599.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/rejusedopurebumano.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9c740d8d9---88787183983.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/59544947994.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977f8b9a97a---56654956958.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/vu3g765lrocjjm0eue1mvdkgp5/73818987012.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/gomabagonopafutesisod.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/timadufapepezi.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/lotalo.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/16634668507.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/41059210734.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/54865169189.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdee63eeab---39646662682.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/86176316994.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1c9c82cb4---55694659827.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/gewate.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa6317b4d4---wukodogugubesaviludonefe.pdfIn PDF document text
    • http://uci.ir/userfiles/file/kirawujexusog.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/bisojosidiguselirubura.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/28007352522.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/gunokagopoje.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a4741c43b---gunekipaxizevovotifan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=musculos+agonistas+y+antagonistas+de+flexion+de+codoPDF 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_off0000c1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E1 16540 bytes
SHA-256: 6e744600b4a0cd2a48b4b606645270f407efe475469fed8cec3115bf7c619408
font_01_sfnt_off0000eb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8F 10860 bytes
SHA-256: 48f05bac4a62511dcbb1998515be6128b1229e175e8e02f547fdaf0e75ead530
font_02_sfnt_off000104a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1