Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c37cde26108c46…

MALICIOUS

PDF

76.2 KB Created: 2021-09-07 00:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cf19431af1aa1426bd33349ac557e00c SHA-1: 6624aa036b64fab8e9924860355cc118915e2ead SHA-256: e4c37cde26108c46b98ce1aba80d3c4406cee18becdf5dbf6d5560868fecbfc8
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It functions as a link farm, directing users to multiple compromised WordPress upload sites and other domains, likely to distribute further malware or conduct phishing. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

Heuristics 5

  • 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
  • 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://ludifrance.fr/userfiles/file/visezi.pdf In PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2c8e2429---49864224458.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/60328707883.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160842220dcd6e---zelagijom.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/97374939607.pdfIn PDF document text
    • http://eva.am/files/722bd74f1c6160ae.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161332aa093d70---vawepegifedimapag.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611daf3741d4c---voronabutakupogot.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e15c0ab2f7f3b7b21e0d015c1cd32112/menixuwobiridewize.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad4d19c497---91824204589.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/18mqmniuva8n0vepmb5p9heesk/92666381695.pdfIn PDF document text
    • http://winso.tw/userfiles/file/tolowolagiderugulosik.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/2lg2ma86ctut9odd80ihdbpgn0/22183847076.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/meganigosepigopizel.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/xarelake.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/nilerapos.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900509bbbdb---97153887127.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/75852055623.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/97ed4190a7acd300e9fc95d8cf67ca17/58995128729.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/68285646894.pdfIn PDF document text
    • http://shosholoza.de/file/46263480535.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/xinebib.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c5504b46dd7cede97e57ddeb71c530bc/46180070842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=hp+patwari+question+paper+2017+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48E 18448 bytes
SHA-256: d7f892b807019201b06851aecf308e30a97a42957951b8641bbbbc4b212c555f
font_01_sfnt_off000104fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 11112 bytes
SHA-256: deff01afc5f3056492bceffaa7eb362a878b9bccb2839b267ebb3343c2909a2f

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