Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd68dfa7fdee02c…

MALICIOUS

PDF

83.8 KB Created: 2021-09-22 17:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 826c8f54f093c514ff374a372466e5dc SHA-1: 2d7b618b84848975841d835856a22850e1079b0c SHA-256: fdd68dfa7fdee02c82493eda8e74cbf3af90137b9f22d98dc1dbb6a70e5f5ec3
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable domains. The presence of numerous unknown URLs suggests a broad campaign to host malicious content or phishing pages.

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://delphin-restaurant.com/ckfinder/upload/files/47277041882.pdf In PDF document text
    • http://refinerlink.com/userfiles/file/dabawenerusobiguxux.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133fd09ab05e---nomoduzopuganaduladile.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/dibonelatudarozubisatipom.pdfIn PDF document text
    • http://klpa.net/userData/board/file/73035270758.pdfIn PDF document text
    • http://namngonviet.com/user-/files/21135892023.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161330d254eb6e---13973241218.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/jikufiwufor.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/87954502903.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161491180af87b.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/78804540508.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/zifotoripakuzudonorupe.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134577af0d6a---81264640535.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/40442855128.pdfIn PDF document text
    • http://momsystem.ru/public/file/gukefojegut.pdfIn PDF document text
    • http://zamgph.com/uploads/file/091015122858.pdfIn PDF document text
    • http://temple.mo/userfiles/file/65093321478.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109152357088020.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/23710622488.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/37443072392.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/vijajafedasewapubinuk.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/laruxukosajudebebatu.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/zoxowajadogukebukewete.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/6188580956.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109131408239461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=apps+echo+showPDF 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_off0000e3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E8 9936 bytes
SHA-256: 3fe589a75258876434441ff925523589365c24b4993e2ee5aab29e3bb2c3e3f6
font_01_sfnt_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11232 18272 bytes
SHA-256: fa91ea76dd38675342ed95acdf54ec394a7564e3c863ab281c01714bf4d84fa6

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