Malicious PDF — malware analysis report

Static analysis result for SHA-256 852d773ee0742e10…

MALICIOUS

PDF

87.5 KB Created: 2021-09-07 06:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c5cce92bef5c35ab7d8ec348bae67f2d SHA-1: 75b71a3881dd744ef28a256064ddc7686b6ebce3 SHA-256: 852d773ee0742e10526176acb5393e79da92722220fc22e1cbfc5b7949f2b437
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/82b2c5859eb2aa63ecafd7e33c89e8d7/wewotip.pdf In PDF document text
    • http://dyglas.com/userData/board/file/regodetunujisas.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/6c2852e3c32fe1216bb833caaf9dd04b/sufotoregagotiraged.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/06gn63gu8i6kqdegusvhqd6j7k/17418772703.pdfIn PDF document text
    • http://agavietnam.com/img/files/38946798450.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/poziris.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/gobazokodo.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/bd6e1f12b29e0810d6492dc384942a73/bajiguli.pdfIn PDF document text
    • https://bmat.mn/uploads/ckfinder/files/saxarapemexeruruvujiwa.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/novakozamut.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/wasevifuwaje.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/54752855912.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/af89cb12e648b075cf05797014bc320f/13830124832.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/pevirogive.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/69096351778.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/80352093483.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/49742321677.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/25203928494.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fb4b2246a25---20806458246.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098511fc2ab6---99548069974.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/ba18fd0d819521a23bd3d37324e11059/jatepozizo.pdfIn PDF document text
    • http://findusafranchise.com/files/files/18788578441.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/78fd25d792f6dabeb7a05d16a9c862c2/bugeriguruweba.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757687ac7c4---fekilovagisuvejozikuga.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/gexifagakexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ives+gandra+martins+livros+pdfPDF 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_off0000ea19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 10860 bytes
SHA-256: 66c5d682e3ca351e273552380a52c99be6bfbe1350c60aef267a2ea8a7a7ae6f
font_01_sfnt_off000102fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FA 20528 bytes
SHA-256: 91ba41ef73ef1bf5c6340354dd8d9855a4b698e667838b5261a10494835203ce
font_02_sfnt_off00013842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13842 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1