Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7120be1be7544a9…

MALICIOUS

PDF

70.6 KB Created: 2021-10-01 03:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9a6c2e92e7f9522b55ae9758754ce336 SHA-1: 28290e36856f6c141237c34fb147816e775e4fde SHA-256: a7120be1be7544a962edd3f3280662cfd834a419f3465b1c24f337e35a3ab724
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its direct lure, but the link farm is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132532a0bc5a---kizejuwamo.pdf In PDF document text
    • http://yibetter.com/data/files/fepitilelomalu.pdfIn PDF document text
    • http://travellerisland.com/files/tewujexobuduteza.pdfIn PDF document text
    • https://bataretak.com/img/files/file/wuwimutakirep.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/masogun.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/58348445179.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/lerupibunikijememebe.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/siwolosuk.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/susejunesuxo.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f831b58a24---214552887.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/67599897078.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/zixedolatosi.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/vesikedepizamibotezonag.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/gajogeri.pdfIn PDF document text
    • http://dsagco.com/Upload/file/69386552051.pdfIn PDF document text
    • http://nincity.de/inline/file/tanegotiwozaxovabo.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6c4c5bc73a25b9226d452996bb67e1d7/judukevetuxufowosoxi.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161305eb4764b8---demaromenabotobefunog.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/30472915558.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/rewivaroz.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/bawuxirejuranapezesifesig.pdfIn PDF document text
    • http://skolky.info/foto/images/file/87563471790.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaabb71833---xabixovinim.pdfIn PDF document text
    • http://millecolori.it/images/file/jogesunada.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/favarizarexad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=androids+phone+numberPDF 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_off0000b43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC53 10572 bytes
SHA-256: 27397d6e6ccea2a57a47aa3e2982493f50464f68e9951aeea8ad23cccf65e215
font_02_sfnt_off0000e3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F5 15456 bytes
SHA-256: fc2e8305a6d061aa69784388594f897617155a1fa60049d152afa49b345a53e9

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