Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e59e6de3f9e56b…

MALICIOUS

PDF

72.0 KB Created: 2021-09-01 19:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 367c15a0c8c3cbb8e96df76b72565039 SHA-1: cb6e83bd55d888be36e7d52e1bce737374f32699 SHA-256: 12e59e6de3f9e56b41bf0cf1dc46990a5fa75ceaabaa986c756681c31beb0e7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly supports the phishing and redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=mental+peace+quote PDF link annotation
    • https://pernambucoimortal.com/imagens/files/nirulet.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/qfblo92s1oh4qsdiuddr4skbbp/92687556849.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/37537757087.pdfIn PDF document text
    • http://0930actress.com/files/files/zupavogojinozu.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff8a76c710---97935050887.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082e977de736---369846565.pdfIn PDF document text
    • http://precisao.net/files/files/26363786380.pdfIn PDF document text
    • http://jump360.co/upload/files/20210623163415.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/6652666402.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/6e0caac30e6ee87ef60d924d66d9b92c/50328436339.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/lovubotitegesop.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/70971788337.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/lowudetititiz.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8uu3hgia726ghrqsse1rshqsl/pelataxutotip.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/47384014217.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/67415514829.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/87149198641.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/i7bufmqgdvgqcr3ttde2te82ip/72512197974.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/765c47d7e8c2a47abd4f8acaa983baea/rizapinoxebusomarobogeza.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16098ba2e7445e---zimavusa.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/seputurizulavapinev.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/ripoles.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c6ee48195a---44414347405.pdfIn PDF document text
    • https://dm288.com/slicice/file/79158602692.pdfIn PDF document text
    • 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_off0000b7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FA 17096 bytes
SHA-256: 5dc978c2b46cc8ef0c384274192314183eeb729adc8e63b54c8cbf70f409c523
font_01_sfnt_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 10244 bytes
SHA-256: 677a10e4b0d1f9715a5554dbe45206c1f03e8044423bf16dd004475f7e7f7c3a
font_02_sfnt_off0000fb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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