Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee39c38440888a9…

MALICIOUS

PDF

80.2 KB Created: 2021-09-14 18:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cf29f70d18b16cf3c80c49103e604047 SHA-1: 8b4838afae83334166fd54a0dc7d5f7517780e20 SHA-256: 9ee39c38440888a9d2d90a33b760641e0c4ca0c5c7d59d5652aecf7ce420c9fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable or compromised domains, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript, flagged by heuristics, further supports the malicious intent, likely to facilitate the redirection or exploit vulnerabilities. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://archism.ru/uplcv?utm_term=how+can+i+know+who+viewed+my+profile+on+instagram PDF link annotation
    • http://cl-metalparts.com/d/files/xudowaponiretezobevu.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec901ea014---78846876297.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/70036241592.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/lojudasizu.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/tefoziw.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/31431506047.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/difozodejifufapupixe.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/jaruxejizidadapejoxataden.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/noxuzo.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f075596442---tuzowe.pdfIn PDF document text
    • http://schturman.ru/files/files/xurigudalifiv.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/zinovunimopaxiba.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/xulewupum.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/96434698298.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/sezelewejokupegixefujavaz.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/memuporilirikaseguza.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/laxuxukevakuva.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ace04df1---juvonufijare.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/bikomebogimufevad.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/61538360400.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_off0000d3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F1 11416 bytes
SHA-256: 2cda500218f9a26e59feedad043712523fd49e445d1e07d88d8338bdcb688cde
font_01_sfnt_off0000ee86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 17300 bytes
SHA-256: bf443dc449624e7ce29da66e2b6e6fba5c02614ab5fe900ee1a148a5f5716748