Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e443517308e0263…

MALICIOUS

PDF

69.4 KB Created: 2021-09-15 22:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0c9fc9d8456904ffca627cd1962e6536 SHA-1: 2a96e8dad38b6994ec192b702eef46139643e3b3 SHA-256: 7e443517308e02635d415e0b598db90448181c4af0ec4709412976e38f6fa45a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, including compromised CMS upload storage, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=granny+chapter+2+game+download+for+android PDF link annotation
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/45276210020.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/9879251141.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebdc57afbf---59155469683.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/fudipiw.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/zujofajob.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/zisen.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/71510970228.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/41641861820.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/mifapavexusofazax.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5ecb26a73---xoriganiwununifovafidega.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/44434536215.pdfIn PDF document text
    • https://ebooksweb.net/files/file/kidaxotusuga.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/balebdujqu08g05uveees21b6p/6806395525.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/m3iqle5b0uf2joisj2lqlja1co/1709238970.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/zikuvimere.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/dagumibu.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/15717498812.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/pirosepid.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/wapegifomunegomidogo.pdfIn PDF document text
    • http://panteres.com/files/files/legub.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613691e385218---wumikavojokurinekoxe.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_off0000b052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC869 11256 bytes
SHA-256: 77c4dd3fe2e6cd465469dd1ec57599242b0ba281cf1ee0ed8990883ae716f1eb
font_02_sfnt_off0000e289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE289 15140 bytes
SHA-256: 9c11fe9db89c5280addb2b512e7f8fe3285e0684825e0d11e6b0e54843fa3968