Malicious PDF — malware analysis report

Static analysis result for SHA-256 b414c0d4b738278c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 17:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b43b1166ca31a2a92a4a524c022cb633 SHA-1: a65e296f573bcd9f8285ae4b0df5670cc322c430 SHA-256: b414c0d4b738278cb63e7647e14980499549be70b819845f15dbdd7da99d35fc
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload directories, indicating an attempt to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristics and URLs confirm a malicious link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160945155d65df---fowulositideferujiwuxegow.pdf In PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/ec5e0f0fb6d4e65e5d458a16edd31f2e/jezeduzoxumelaroxope.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/pikozujupebuxalekezikuwo.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160efe7539d9c5---46835656953.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608797c1a1a68---87206169904.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/533c8e04620cae7fed8149d6823f9268/5341550491.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/vejuberebis.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3405917ce---56560909743.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610b545aa3aa4---76023293028.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/78853698748.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc11d8d53bf---nawatireji.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/c69o4t48qq4bbki6bvri7e2iig/nusesadezujuwogow.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/2990141655.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/74132169381.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/riwerupo.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb493faec68---womotaresuduvopomot.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/wurifamubededada.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/gofixupedebodulafojab.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/fasipotuxibogeje.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/5279448810.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/vapel.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ff9d5adc4e---37731680815.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/bamanogiwevagok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=embryology+by+sharjeel+pdfPDF 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_off0000da41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA41 18988 bytes
SHA-256: ba309d1ba5ad2b9377781999428e79a66f484a7aa83f15e9fdf7687b4a7cede5
font_01_sfnt_off00010b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1B 11020 bytes
SHA-256: 0ef385b359a05263793153b2d79ef362049d590323fa5d7b52c2da1a84bc5d8d
font_02_sfnt_off0001244f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1