Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d133f3ed4cb78c…

MALICIOUS

PDF

83.8 KB Created: 2021-08-09 17:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 62e0e37bc10e06547a03ec2672fc4e65 SHA-1: 8560adf99b64817dd77da42065c7338ee6176f32 SHA-256: 18d133f3ed4cb78c87a9db4daf1e49bf496b03f357d5182c1093e2af71e92247
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://nrnchina.com/test/images/ckfinder/files/4019047278.pdf In PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85efa83c5e---18477949779.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/dewerere.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084e41449d37---65612670251.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/iq3uv6023dm18qdqourph7tn50/35994452153.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/90935908348.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073076fede5d---vanaxakokonuxud.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210730224402701.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/kidusuzufa.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/0b85ffa41dc1b00fc0db19899f47a37f/nideduzuwagap.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ca18d8480---jufesigabunos.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/a88ffccb732fb53a2396897cacf7453d/zumezub.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/43590486870.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/gasevodone.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/zakutazufenujosaxurasos.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/3156551736.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/15465116002.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/23534251310.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3f171c43657b6e4c8862f85fc056bd4b/97606033787.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/69425241809.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/35559165537.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/78113730008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=where+can+i+buy+a+thermal+fuse+for+my+dryerPDF 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_off0000e228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3F 11088 bytes
SHA-256: 100571ec457139ba5b283d86426266397ec403ddd6f2084f7599e6314eb3e1b1
font_02_sfnt_off000113eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EB 16964 bytes
SHA-256: a38d1ec924559ef453ca0d9e116c8282c70847adbf0731c4d898d6fa519f8350

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