Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcaef1a889eb28c…

MALICIOUS

PDF

89.2 KB Created: 2021-09-02 19:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 7a106d4f227acc627ba6ef7d0058a55c SHA-1: ea002bee89b1b175c4fe9ec5374841603ae5986e SHA-256: ffcaef1a889eb28c1d0227f5b2736541573d7666a911992cbc68b455040e68d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=sindrome+de+abdomen+agudo+ginecologico+pdf PDF link annotation
    • http://ezibra.pl/upload//file/xujanojafotanuxivuxijo.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/1600918531.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/68368596383.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/cf76546a261ff4dfd656a0fe92b0dd08/18456483775.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/wabafifim.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/35925536256.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161091df53c9f2---pojofape.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/d28e19fde85899dc6611a2a9f760f91a/fifis.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/20532833658.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa861611c1---86892625567.pdfIn PDF document text
    • http://didopack.com/files/81071334329.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/60809220671.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbbae86733---11042204694.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/26567980929.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/tazudusu.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7ed92a65eb---segerala.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fc6769236---39651636577.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfff2f48d67---tufesunofa.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1258922755bc335b1485ddbac9f144ca/39528768405.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/70275331278.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607770f77e897---jagobidugajukavazabamo.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/kixoredujiditewavovar.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/8439247233.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_off0000f264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 19848 bytes
SHA-256: 5a11e955a1286d0fde3ec7251d2d1cb68f3a6a00f01114d660bb0c4a2e47be64
font_01_sfnt_off000124ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AB 11012 bytes
SHA-256: 09c89a848b37db080e5f490dcc55c24744440c02ddb04c5ffb53515f1ea753c2
font_02_sfnt_off00013dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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