Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bdf7029e8631c1d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 01:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3fa057c44e8501587587fd3a6351d072 SHA-1: 78fb76d0b03596163024fd7e4a4deb022c98a2a9 SHA-256: 3bdf7029e8631c1dce2c2c21baaeb54db9fc3983464081e395bdf0bbfec7a13d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external, potentially malicious, websites.

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://ufnk.fr/app/webroot/files/file/84760383896.pdf In PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/gj8aitq8abat7ut8o87ou721ue/55426253119.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/6cba0884e333533332b0eedad58bed7b/palozewabulawelededa.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/piwonisumojew.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/84ba81244d0ae6d323d1d788c05d31ce/nafusekoxilego.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/rpmo4v0o47allavgc7vvlbvn8u/nasaraperuwi.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/buvukugi.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb94bdbce4f---15362602837.pdfIn PDF document text
    • https://yellowstonewildlife.com/38617950988.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/6c5be34ec2e2c07db34737c7948742f8/xajujupurek.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bolewonizovupokukibisupez.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/jejofe.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/xozisuvovunefixowuwe.pdfIn PDF document text
    • https://sanagustin.cl/files/76591906097.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6afa50145---38539311605.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/guvogetejafavawebazute.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/jofokizikagariwudud.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210827114303.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/7e26c4eefdd240244be6b687ff0de284/jafuziseveva.pdfIn PDF document text
    • http://m4krichmond.org/clients/3/3b/3bf4c986be49c21931b3574e72fd8103/File/9823338362.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/98055535443.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/877847624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=tri+phase+american+dj+manualPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e0c061b4b2f82b3a98128c8ae95218c8/29709853449.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD498 10752 bytes
SHA-256: 8cf1591b7946991444b2277e6b41a898c9558ce1af0f4a7d8b69d5341a1f077c
font_01_sfnt_off0000ed0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0C 18900 bytes
SHA-256: f5c48d6aab810638c888d88e0024abbbec144a862fb38940012679b569cb889b
font_02_sfnt_off00011e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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