Malicious PDF — malware analysis report

Static analysis result for SHA-256 c570c419c227ec08…

MALICIOUS

PDF

88.2 KB Created: 2021-09-01 18:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2aeed7b43670922fb1fdd1a8f27c8c11 SHA-1: 9e3d188e8e9e0005619f1cacc9b20dba605631bd SHA-256: c570c419c227ec0811b79ba96ea2cabeadbb97c54a0d45e4b3923c53dc64ae87
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document employs a link farm strategy, directing users to multiple domains, some of which appear to be compromised or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document's purpose is to trick users into downloading a password-protected archive, likely to bypass security scanning. While no scripts were directly extracted, the PDF structure and link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • 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://d-a-s.cn/userfiles/file/ridelojutoreke.pdf In PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d0be6ec6409---siwifovibisuzeruloso.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/37869738054.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/69753035381.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742c6107856---wirimosoguwajaxi.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/26777602102.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/kegusazisamizafazo.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/25841040956.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/bukexujigit.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7782369a80---xugegutivosimonumigif.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2635a24e47---porowinudidukagazaki.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/8099088734.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e9182c8a---46230086709.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/48059803260.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609d91f4ec7a7---344345645.pdfIn PDF document text
    • https://ivanamihic.com//files/29798393929.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/21847864967.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/nololofosotagikibivew.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8deb9a5c02---fulaturarurusoxijoz.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/pevemekukukoverenezat.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/rinamenug.pdfIn PDF document text
    • http://defaico.com/d/files/55335997108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+often+should+you+replace+ukulele+stringsPDF 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_off0000ed9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9D 18736 bytes
SHA-256: c706b9a8c535b501836cda87ba0b86386a17fb36bf02e49100c0dca0563a3959
font_01_sfnt_off00011e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001368f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368F 11284 bytes
SHA-256: 376e9e3846f46993aef6c7746e7d0fff0d5b70447a47a61b83260f8f4bc05881

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