Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee2d635b19d5c777…

MALICIOUS

PDF

99.1 KB Created: 2021-07-18 12:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 61e05eeacc50b53a803238ac16001ee2 SHA-1: 62ec37af9dde9ab0aad3fcdaf22259f6b7b1a48e SHA-256: ee2d635b19d5c7776e058b0f49a6eedaa9e533dadb97f2be13e9777e6a279bcf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the PDF is part of a link farm, with many external URIs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • 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.
  • 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://amandatour.ru/js/ckfinder/userfiles/files/gexubajop.pdf In PDF document text
    • http://sun-eko.eu/files/file/60524876284.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/cr3u70b9tugu8nknutjr7nfl32/polofamiravumisas.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/20431379781.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/45747234640.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/37822177820.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf9311c962---tidebenoje.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/f7412458071d8336e5454aa641e221bb/tosunagemusedewe.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/qj8er1mhvn3lasln8sf9fpufbe/52536760519.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/fvuhlcsmnffe3ksvgdnnutrgip/migavowinetasotoxiwa.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/64a09e798ce8f0a72665f4a0e9684af7/38440272200.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e871fbbfd17---68164380848.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/eq6u9gvkb2rqmihbkperglb6a5/27679554597.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/nevuboxitakuf.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/49857528854.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f9596c974---2469460450.pdfIn PDF document text
    • http://olympusflights.com/files/files/rovisikupuximasixik.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/80054609913.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/f6e20474814dc36a9bf7625617e9a5ab/sunudiguxufino.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160739aef6d1c7---20262804859.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/9a31b08b36bddcbe235a9e6f972f9c79/xopekup.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/tomodebata.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/gopevomofixeja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+many+eggs+will+a+goose+layPDF 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_off000122d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D6 17656 bytes
SHA-256: 28ff4c5cd804c9e523d13d2a252af25bef79f7a095b33b534175446b968510d4
font_01_sfnt_off00014f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000167a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167A0 10444 bytes
SHA-256: e434f42b362cc13dc107811711ba63b061cac80fd1b11fe894ff6ee99827a11c

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