Malicious PDF — malware analysis report

Static analysis result for SHA-256 e755c49398e63ae3…

MALICIOUS

PDF

95.6 KB Created: 2021-09-06 16:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4732c684e758c3dac11e637a55d53338 SHA-1: 2e01396ce87736e007818ea32fc88163c9cd27c8 SHA-256: e755c49398e63ae392a6a70e2d090f265930b2923db22998b79697363829f0b7
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest an intent to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.2156

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://signika.pl/Upload/file/18347353976.pdf In PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210903_194653.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613007dd50584---jewabekejuku.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161296203eda24---bagage.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/80311074868.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/78694544835.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/lofeburatoximupikadogeji.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/43215063470.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/60553970593.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/jemaxuxuxa.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/9f5ca6c2302e9393d9209b283018a32a/wasoxusuju.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc2584dd60---82156144321.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/21642283155.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f204a5fdd5---xanususudorebifataluved.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210709190049.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/21c1e4eecb82373c0c66bafc7d68d733/mesudunizopap.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3f2a37f71---bapovuz.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ef1fbe6e9---20550601666.pdfIn PDF document text
    • https://nomortiga.com/contents/files/tipiwer.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16103db07e6897---toxapiluzexodewowijimudad.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/40879325116.pdfIn PDF document text
    • https://triosms.com/userfiles/file/vowogelipopazebi.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/57905299702.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/29876078900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hypertrophy+coach+program+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_off00012e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8D 10764 bytes
SHA-256: 08371f389647c2d02f37b182352e140e9ccb402a672dd1b4ac4cd7bedb1bf51a
font_01_sfnt_off0001471c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471C 18800 bytes
SHA-256: 8d0ff544f1680ea49bf741d4709d1a784aa127932836aeeee3cdff92d688994e

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