Malicious PDF — malware analysis report

Static analysis result for SHA-256 b01a8b6945b1dea4…

MALICIOUS

PDF

74.4 KB Created: 2021-10-08 22:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d53be5aba9966b2fb2bf6a9439379b8d SHA-1: c99d3341e7de83bc572d2d070453772d0da210a3 SHA-256: b01a8b6945b1dea4197f5bcba130f32b90f3aec905837c7107ea5c483da04a56
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggests it functions as a link farm to distribute phishing content or further malware. The primary attack pattern involves luring users to these external sites, likely exploiting vulnerabilities or attempting social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dagvandearchitectuur.be/_files/file/zaxewukewededajalogojedu.pdf In PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3ff4c1d02---vikigetexufewadafag.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/denojelezusemipetu.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161344f9658592---nevavarogawavukivotu.pdfIn PDF document text
    • https://noventa.cz/media/files/file/wimegalasikuzamo.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/givesefoxerubovukimataw.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210923122106.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/46471477478.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-10-6/20211006141010305119.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/31748936369.pdfIn PDF document text
    • http://cabini.it/userfiles/files/14763463035.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/kodapevidavijagumewede.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/52961676775.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/pozejakekabowotamagude.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/70999970944.pdfIn PDF document text
    • https://majubesar.com/contents/files/16011833082.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/65996287117.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/xezuw.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/71166872149.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/mixilux.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/42182288545.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/26622137597.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161607f7dddaf3---jobipimegodidinivi.pdfIn PDF document text
    • http://all-premium.com/user_file/files/fewuwimemalesij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=kenneth+hagin+move+of+the+holy+ghostPDF 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_off0000c02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD844 10732 bytes
SHA-256: e913448237c11807e8ee71a59507e412b31cebbedb5fc8c7decd383844c0f180
font_02_sfnt_off0000f0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C8 16860 bytes
SHA-256: da291688408cca4bcfbe184732f1367ccf891d4f3ae91b80ae8695c44be2dc3b