Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e508a87d311d99…

MALICIOUS

PDF

85.1 KB Created: 2021-09-12 10:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5f1f3dedd1b0e02ac1b2f163a63a6c08 SHA-1: 6a63b7526113496cb4879bcd71f511fbbf0de475 SHA-256: e2e508a87d311d993a89b7f779e7a6f9b1226cc37306cbf5083bc831aa07d894
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. The heuristic firings indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://imhkayseri.com/resimler/files/1573388646.pdf In PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131631af0d76---65737286276.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/rivaxofav.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/papuveta.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/mowotubizidirefubupivunud.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/zobusalapukevetan.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161371b83ab668---zutidiwopaxaxaliberij.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/xiluwidiletife.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/90508452874.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/44140378896.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/99957424402.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/76755739474.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/vujazavenovupobepuk.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/dukimina.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f3ef06d61---5710290447.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/sutozijuzavi.pdfIn PDF document text
    • http://exima.kr/userData/board/file/16153179522.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/15226806502.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161395c5ac3fc8---bisarew.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/durugarugesir.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/83195152908.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/sobuwifazofage.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/bupifexolanibowijazabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=app+guitar+pro+androidPDF 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_off0000e88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88F 10300 bytes
SHA-256: 2ff9528b45aa8b3f73b084405fdbb6328d73b2217f3a76229b10f5d0077d0d3c
font_01_sfnt_off0000ff9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 18064 bytes
SHA-256: cffe28d9ae06262c4e9af5819ea4b8e3b83c49423f3c65f0883bbcba631c16ba
font_02_sfnt_off00012eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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