Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa5c936a9500780…

MALICIOUS

PDF

87.6 KB Created: 2021-09-10 13:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 423422af24773e5e8099df5af633392b SHA-1: c6ed1e8acfaa9f8f8bcaa40a15df77f5cc24d22d SHA-256: bfa5c936a9500780916d5fb649b949af97ae00b478eb70649e2d267e6b3c572f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate that this PDF is part of a link farm, with many links pointing to external PDF files hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://hulstcustoms.ru/uploads/files/6318695779.pdf In PDF document text
    • https://charterboatdeliverance.com/uploads/files/tukinutinixoporawepezuwaw.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/54979651422.pdfIn PDF document text
    • http://artepcb.com/upload/files/84919030543.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/23648048000.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/42695778188.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613046d7133ca---84083047493.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/bunuruki.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/61357af010c5f.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/80693421828.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132c91e5be2d---sefigixiludakaxoxudi.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/20015068752.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca2b408d6---68128856190.pdfIn PDF document text
    • http://ciskmv.com/css/file/mumigotadinotizijebarero.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/zudupigo.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/sorotolanabanajon.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/35267312179.pdfIn PDF document text
    • https://nexusmediation.nl/files/76173319535.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/68073950163.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/34906995670.pdfIn PDF document text
    • http://topstec.com/d/files/87929535998.pdfIn PDF document text
    • http://orrizon.ru/images/file/17008311223.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/42713258920.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/fegavuzemufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=edit+photo+background+android+appPDF 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_off0000f22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A46 10760 bytes
SHA-256: 2575acdc547cf6566773d424ad6bc2a8cbc60dcef72b6e70c93f1579af18878f
font_02_sfnt_off0001227e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227E 17756 bytes
SHA-256: eb0013d194824987caf9648b5d6ee011daa5f43ffcb96693082c095c9a3785da

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