Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1e38e1cf99826c…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 13:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3e1bd411bf48041ab60a222a10d799a2 SHA-1: 3887a3d2342566ac5b0c9190812cccf305ae2eae SHA-256: be1e38e1cf99826ceb310f0116809f2ce2c364c3053ff53959f0b4f4240d7db2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to other PDF files hosted on compromised CMS upload directories and disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/gefujo.pdf In PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df514d83ec9---78109791057.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/7smqufkn4jdimn6hc8uno47ego/lowowiroxuludakize.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedb545674e---vazejebabuganijix.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/km6jd4qjv7654hg40aaelqn056/vexefop.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/36539978867.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/80936225172.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/gavasomoxesasijasu.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/tokobapalasisoxabek.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/10760304105.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/xikimivogibeg.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e742da508---fenuperofipi.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b46f937db---23342533840.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5b73c3022de08aca87db73a5aa848ed1/kikarewofikesakefuwax.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/56107954889.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa9886e77b---pabibebomuzenawemulopud.pdfIn PDF document text
    • http://landpas.pl/upload/file/kalogozesuvikulipoto.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa57d51c9a---150724931.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/dijofopadegoxinajosido.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/1cc63d0ca302cbf0cabba80813b4e95b/5720878672.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/zubafezejuxewutex.pdfIn PDF document text
    • http://www.moyekolodin.com/files/86406165449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=casio+baby+g+watch+user+manualPDF 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_off0000e2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 11148 bytes
SHA-256: bda8ba6e22d58f3a7e8d93536678e8be5e4fd84f5b1c05ad99602054a1323664
font_01_sfnt_off0000fcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CE 18064 bytes
SHA-256: 9d560e67c29ff115f5af879abcd425c8948ecb492e9e8c3889fe257c40761521

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