Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1c5cf158b083db…

MALICIOUS

PDF

100.2 KB Created: 2021-09-06 08:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 04f8d9f509ba56c8ed2845300166c47f SHA-1: 95e6cc0dfd03d6fa7ed8a5ef81cb9b7eff296cc4 SHA-256: 4e1c5cf158b083db1c99051628f4c55978e6a2550a3de455866e1fafc1321247
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://phutunggiahungoto.com/uploads/files/93710660543.pdf In PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/cthnf3kgemjf14g4flkogomcp7/wakidepis.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/4426e20e5ee513b91e94fe76db8fdefd/duxaremilunu.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f616512036---saditanelijogo.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbea6a0034---18503900932.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/sanelotujinikexibapisow.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afde9079550---10051567111.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/18178049641.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/13571aa75beb186ae7d29799c7d31186/41107138733.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae04496f4a2---66316848109.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/regiwe.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xowotorabiru.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160757cb2d8171---3547739475.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ede50d04eda---46754234077.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/f29c973665471777b5b2a038c3dc6b00/kuxenitadezenafopekezomap.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/21485051143.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8018b587b7c5264ff59db1dcc753b061/tuxaxoledozisigegiloxejis.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/wuliroxekatexufi.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/witabixogupoxa.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/walutevekapumoduz.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/zexidob.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d8cfa639f65---mezavebugedanufixutijag.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/xulivonisivedesoju.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/k8q2fv5f7ktl4msoagcrua0uvs/95330706223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=inheritance+set+book+guide+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/93535210739.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12139 18304 bytes
SHA-256: 0dd365fd1d2ef9273fc802d2baa7fe3f8d18a341847e2af2d00d3f078e91b795
font_01_sfnt_off000150d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000168ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168EA 11136 bytes
SHA-256: 01c05d75113df6c9e1b3fcf0a16b7124af560f4778f98ac7035923c8fec64275

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