Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da21c5ef4915bd2…

MALICIOUS

PDF

88.2 KB Created: 2021-09-03 01:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 52df19976b491b95d2335891bf41771b SHA-1: c5486ef75d3d53a8f1f8fe2846f75179ead9b86f SHA-256: 1da21c5ef4915bd2a73e42ab0b9ae2904229ce5648ffc8c92fa96b959f5a2b94
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for redirection. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic where users are prompted to download an archive, possibly containing a payload, after being led through these links. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • 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://hitecds.com/userfiles/file/rotakefofivek.pdf In PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/64233862858.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/95661201631.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608683a62cf35---81663148869.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/79885199882.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2819aac3de---muvuzigudow.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/261309461062.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/daforazi.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd4e389cf6---54081120192.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607624df472d8---kobit.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/39839811569.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611c3eeea32d1---tarevow.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/venilun.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/32e278cd53c3509efa6776e475700ad4/98771887391.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/rafuxuxonozorigapuvak.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311174327e1---57656121494.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/98624029546.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/japexexe.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b83a0460431a30806f578b839e495a63/fewoduriraline.pdfIn PDF document text
    • https://777mto.org/contents//files/bazabakiwifosuwelasux.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/dogonabe.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160afddaa5b147---8235825169.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/belutujosab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=triple+des+encryption+algorithm+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_off0000ef80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10797 11144 bytes
SHA-256: 1996c3648a6a44af6685285a0c96d7f1a87ee56a7eb1deadb2bf936bc25d6f52
font_02_sfnt_off00012133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12133 18696 bytes
SHA-256: b5cbba4008bba9133dfec17e86a054e96c1f2bc365eaaaef868fbcd739416ab6

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