Malicious PDF — malware analysis report

Static analysis result for SHA-256 8267407444a3686d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-14 02:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 201d57263445338931f1bd41216e9834 SHA-1: 0cc24d7ca6b8a97b688095e7824b2c40f813a72e SHA-256: 8267407444a3686d987178eca1305fef47d9e6edeb8665633b44d110d61a86ad
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to link farms on potentially compromised or disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive, suggesting a multi-stage attack where the password protects the payload from initial inspection. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://www.milestonesmn.org/ckfinder/userfiles/files/wulovosedopuf.pdf In PDF document text
    • http://generoussecurity.com/uploads/vitabijuke.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/lipoluxi.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/popumojakoxifolus.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/12471645158.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210905055404_1189829403.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/rabijozetavefawav.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9dfe8dc4b---fuxim.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/xadizutasukokibofepoduxo.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/41552040245.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/wugevana.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137061ad8cc9---wisebenirubiridaxi.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/8494826440.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/47608266908.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/60581243425.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d78f2aeb42---sipinagefezogotemevadake.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/99505788227.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c6f10562e---22107046184.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/mamusoxitojezewutofaxek.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/zopikunupepojo.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/91841023850.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/44868579939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+amazing+spider+man+highly+compressed+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_off0000df18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72A 18748 bytes
SHA-256: 19bb03be3187074d85cf0ac63ca74119a80a06d1fbe15a7bd54c9ddd7a75e0b2
font_02_sfnt_off0001286d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286D 11000 bytes
SHA-256: c054b42436dfcf61602cfa2f2dae8ccb85042cf453546ded89a87842dff0ecd2

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