Malicious PDF — malware analysis report

Static analysis result for SHA-256 9403012338124923…

MALICIOUS

PDF

82.5 KB Created: 2021-09-11 21:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6990319cfe0d072c12d57e80af45bc95 SHA-1: 2d8e3d66e815dfd74a82cdeac3a60a669e89ffd4 SHA-256: 9403012338124923c49256e6f4ad9012bcc48df4a592999eb9f70457d469c9f1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF document is flagged as malicious by ML classifiers and ClamAV, and exhibits characteristics of a credential harvesting lure. The document contains embedded JavaScript and links to external resources, some of which point to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing pages. The presence of MFA/one-time-code harvesting lures strongly indicates a phishing attack aimed at stealing user credentials or session tokens.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://saintarseny.ca/sites/saintarseny.ca/files/file/tepunejajelikomele.pdf In PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/pesok.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332fa7b61dd---kakiginazigipotagikeg.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/6672527768.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bbc24d21e---feveroxulu.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/75488771630.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/kipesemiko.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/zowux.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/7460011742.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/66875202998.pdfIn PDF document text
    • http://entrackintl.com/uploads/sesasoxu.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/sotot.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/80482153376.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bbc681f5f---vivagu.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/sarizuxujufefodokodosud.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/1304345035.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/41989095825.pdfIn PDF document text
    • https://birotex.rs/images/files/peveropemer.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/wuxagifawefagod.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/wosigitilapa.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/56564631338.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/tenenetubimapepiloz.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/70342118272.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/tifizuzataxizikagamixuved.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=update+messages+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_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 18924 bytes
SHA-256: 338a6ecb61d62149699b46ad84da2897c6e12f48d8f4e71aee373e3a191e7215
font_01_sfnt_off00010bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001240f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240F 10696 bytes
SHA-256: 4e00ec2cbfd127c321983c42846cb20db0eb6857c0ac0e0072c31e64b0b4767f

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