Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1de7cea3f5eb074…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 11:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 0207a87de3a37898c5f6c42d2adec477 SHA-1: 99333d007b3aed2a32bdb53b75b5040cdbb189d6 SHA-256: f1de7cea3f5eb0747352a6ed9b463e5e931f2e7814683c21d196a42ecb0e51a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier. It contains embedded JavaScript and numerous external links, several of which point to compromised CMS upload directories or disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of embedded JavaScript indicates an intent to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.gyndoktors.de/ckfinder/userfiles/files/xikefexo.pdf In PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/35084555359.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/79023460628.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/runodapatuliwazegarado.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608baa1b64f53---51828097639.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6821ebe2a9---43008327402.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/81951347298.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/tiroromunoleta.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/3917457596.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fae6a7658---16557985971.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e83666f83---99095207528.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202108151231416483.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/50779558450.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/luxuropugu.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/lokubodefenusajisasizax.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/66156654674.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/26189342345.pdfIn PDF document text
    • http://wenxuezj.com/images/File/rirewovamikixevegilo.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/58984927784.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/61715613313.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b650cddf5c---bopajedesuvubos.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bee280325d---9828290690.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/k9cc140rqq1vs9qgj6qreg6j7j/donopibulerigetepoko.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/bedumimod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=north+carolina+durable+power+of+attorney+pdfPDF 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_off0000e503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE503 17568 bytes
SHA-256: 3ca7e801c0a7cceba0070c33cc06ef7fc4758db8d5eedeb48d56d43ffd68c214
font_01_sfnt_off000112a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB7 10968 bytes
SHA-256: bd06150c85a845e6237703b11a69d4056260c20b4be0d2282422e97c2fa09494

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