Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6582ac48afec66…

MALICIOUS

PDF

74.5 KB Created: 2021-08-29 02:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 13634a89b2d3df39c9f51138c527c0f4 SHA-1: eaef31ae73a04fcfd34192a555aa3c8114219393 SHA-256: dc6582ac48afec66888685528164e49851849b35c4b3fa3fd3c023ec3dc5f22a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm or phishing attempt. The presence of multiple external URI heuristics and a link farm detection further supports this attack pattern. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://vet-arrighicolangelicristilli.eu/userfiles/files/86727638373.pdf In PDF document text
    • http://intergeored.com/upload/File/gubekeg.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/7n79rrv3chnj46e5hd61a8mbj2/87782802254.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/p4lh1upjvrbujkh1jc28sjudea/xinovejunenonevadebis.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/jawikidap.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad398766b60---zulifozezalifanotumixo.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/26419256413.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfeee26cbe0---keravizafesidatotixu.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2678f4568f---jisapulububuvudomafiriv.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8028bd1571---64181019761.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41c4c12523---79358461994.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/58398207761.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/negebupisaniva.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072de64e0013---34849912360.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/84102133897.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/b9757cij7729ugi64tt85c14jv/52852609256.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996719cbae5---86680664189.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/7017168349.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ttk5te9kmhshfq65bsr7bm97pb/jiwaxo.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/pefilaloxafitiji.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/rewegasurob.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/40226665563.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/totulojetuje.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/rotisadelaguta.pdfIn PDF document text
    • http://imi.vc/upload/files/82798089287.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/7e0d321cda9e6c57c5c67198e6dc0056/55302754920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=states+of+matter+worksheetsPDF 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_off0000c148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC148 16584 bytes
SHA-256: 8922ee8f3d0d0598e67bef209a80015d305e35860628a960cd411d66ea0f9ab0
font_01_sfnt_off0000ebc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DF 10492 bytes
SHA-256: ebe22aa9d9ca2195fedf0bcfd6f0070b84c331a7d734844050993b5dc8074b93

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