Malicious PDF — malware analysis report

Static analysis result for SHA-256 a234beb4145d5ef2…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 09:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d179227cd5c0bd687c97e65bc99c7436 SHA-1: fdc312084ccffbe8260de3085910aecdd6609186 SHA-256: a234beb4145d5ef2dd6df874d11f0996f8af3c61554be3b27354447401ca8c1c
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428e83b6556---debat.pdf In PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210911_063031.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/53584935493.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/pasuworuriwu.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/93638702602.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161411288c4af9---1536594518.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/ritererojape.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9a4ed8611---69389645355.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/4293787844.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/laxolazupolozojumivutep.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/93466012906.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f022464fe6---38063322792.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/junixulim.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/rimirulepozum.pdfIn PDF document text
    • http://gzpropellers.com/uploadfile/files/bajig.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/38337117089.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/bofugaxorukanalatopoguxi.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/14266790008.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/73538677693.pdfIn PDF document text
    • http://strandedtattoo.info/file/49256853561.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/vonilozinuvirivof.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614487f050437---mozigemamawizuzaxa.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/jibagopek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=play+me+some+moviesPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/dozibefa.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_off0000b18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A1 10148 bytes
SHA-256: b2872e1b9906213903f7989600bf4cca6f48e215e78dbf9f36442b01bffdb598
font_02_sfnt_off0000e058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE058 17132 bytes
SHA-256: d9c167bba76ebb56ac437d9ff00efc8bd331cf86c875259ddc59072c3dcef12d

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