Malicious PDF — malware analysis report

Static analysis result for SHA-256 72cc7147ccdbf1ec…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 14:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0aa7c4d2f6b4bad54030af1aa918dc22 SHA-1: 33727a661860d85cfcb1984ef896da85e92ff4dc SHA-256: 72cc7147ccdbf1ecc84cfae22e11853f67b6e5f70a97a8823df15118253e1398
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute further malicious content. The heuristics indicate a link farm designed to obscure the true destination and a lure related to password-protected archives, reinforcing the malicious intent. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=app+freezer+without+root PDF link annotation
    • https://ecohort.info/userfiles/files/pagezasuf.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141c4861bdc5---kiwikali.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab8a631f6---zugopimukuleman.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/tuzivejufixazimitituzub.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/zapol.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146187c4ff57---lonof.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/8480284022.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/83518304199.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/mvluhj41q7pbmio1pco38drfiv/17639376202.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/wogawikopowe.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/nozesumob.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b6f2e4027---58398861812.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/nusomifudo.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/80006450206.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/57303001197.pdfIn PDF document text
    • http://lyshiying.com/d/files/madakowirukukex.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/2855290662.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/10191254917.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/96569726983.pdfIn PDF document text
    • https://anjingliar.com/contents/files/35321049919.pdfIn PDF document text
    • http://cocoal.com/uploads/file/25291041393.pdfIn PDF document text
    • https://agrando.cz/files/file/kumasigubeb.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/91787697657.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/81060361066.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/23534190778.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_off0000da0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21F 18552 bytes
SHA-256: 8b25a97cd33bbef6f16b81dfef369ab7cb52d7db99161b0f944118ff1adfaa03
font_02_sfnt_off000122f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F8 10204 bytes
SHA-256: b015aa454c5ba9047f2315072e43e591468066b2d791f02e987655d2b3b73c30

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