Malicious PDF — malware analysis report

Static analysis result for SHA-256 28eaafcc76451dd2…

MALICIOUS

PDF

72.3 KB Created: 2021-10-02 10:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 049f3e96b02695f4e3aeb9351533beda SHA-1: 7c6d001d4185ce9b050b5577250766d4cf37a6a2 SHA-256: 28eaafcc76451dd2e6b81c03aa4f3767f90c06a3407ce6a4db458c4333525e09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://naveenent.com/administrator/imagetemp/file/nexiki.pdf In PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/kutuma.pdfIn PDF document text
    • http://chromavials.com/d/files/kuwox.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/kodog.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/relewaritol.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459afe34f01---gebajibakoxuwaxiledinip.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/wiwubiz.pdfIn PDF document text
    • http://temple.mo/userfiles/file/lizovebuxoxugajarapenasi.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/visomiwuxazimusova.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/34357074281.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/e26b7476729312c7f412877db50d10f9/liwalenosupowekunowug.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/40850745117.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/58217441229.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/duzoz.pdfIn PDF document text
    • http://koddous.com/userfiles/file/xupidubilid.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614e2dae99627---50089423362.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/729870759.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613aff603ddf8---43720391883.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/jikizujor.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/290909defb2e2ea0a3db220ddc786c23/64583450231.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/mowogusokasawizidigixiz.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/zosanivesopuguviji.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161476cb11d77d---53125833552.pdfIn PDF document text
    • https://webhosting4.net/media/file/20512684799.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210916170401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=even+though+although+thoughPDF 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_off0000b5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B1 18800 bytes
SHA-256: 96893a06d8cd4f3fcb985060011deaf3263c116d41ae5248acbae86456e846ff
font_01_sfnt_off0000e502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE502 10176 bytes
SHA-256: 4088ac004f5d37402b071aaaedbc10adcf8d2730eead97967f4646973f044314
font_02_sfnt_off0000fbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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