Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab9faa2848da682…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 12:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f736aefe04428567016ae67a47b7628f SHA-1: 5fe1ae4d0d5b84456159762fa9562f3f8174d37a SHA-256: 7ab9faa2848da6822499a87c9d711a641e653e42519780c08629ce5d1269e98b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these redirects. The embedded JavaScript may be used to further obfuscate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://pistant.ru/uplcv?utm_term=machine+tools+book+pdf+free+download PDF link annotation
    • https://sapporomn.com/userfiles/files/mazorebetajiwafovikazas.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/lasujutaxesiroxatunixolip.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/vumajilaxakuge.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/51996917103.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611ba22539330---27214868739.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///97941335676.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/lujoke.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16080489bab002---lovokijukodis.pdfIn PDF document text
    • http://goref.ru/files/file/33388509992.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/90c5436b8cf0a9e52a97301c2124a813/11915767732.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5e029a461---zugezenatenopurelut.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ceb516043---mometupelalezejefizobolu.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/fowinuzakamawaguzina.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ecgmfvi7h8f1vsn41j9780r0s7/kobivasunozu.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f1b074aafc10890cc7f47befdc8008d5/dojuxobofotusoriradavafo.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089a9e5384d4---tawexevan.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db0f1ae4b48---11243168534.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/fejabibakodilagazikifibog.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vsh5onb2vffmr1lrsc0o5jcmr5/suvilopapes.pdfIn PDF document text
    • http://i-physiology.ru/upload/zavojosexosi.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051310222689.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/tivixefagedepunolumawol.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/a8caf960ab210b14691db2d4ad6e6d22/14831612429.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/45742556791.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee9070307a---nasogofazatobiwanin.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/30803583383.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_off0000d7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD9 11028 bytes
SHA-256: 5a438832f68fad4ab3e395f60d7856c0b70e3110f963d277609db5b1a69b692e
font_02_sfnt_off00010949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10949 18080 bytes
SHA-256: cff7f1b547e95563cc42481891e0098e191d50874d190ddb4ab3e5531d01fdf3

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