Malicious PDF — malware analysis report

Static analysis result for SHA-256 82eed3531e6b7f7d…

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 04:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 729c2660594f59830f54afc09c40dae9 SHA-1: 08ed2acddc1f21bf6f7917f96f895a923895cf46 SHA-256: 82eed3531e6b7f7d74ace977f946947f4e44d1219e673c6d2cec158f6541d9dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=odontogenic+infection+bacteria PDF link annotation
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/ef417702daa6d8ab7d3d8bcfea129c9f/zapumakibezo.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/rekurugejojatexiw.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/62099489296.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/913831ab1f4e3d8700f45771fe1b3a2a/kesavanisib.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/66317763968.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/muvajewiwukegazekafuvol.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/6de15415aae2d95c20aaae8b0c67942e/lusolubusirobajaza.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ae3410750---25642597081.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608c33d3b5a1b---faxorefinunixunala.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/zajotofubulamuzokinerovi.pdfIn PDF document text
    • http://safarang.com/basefile/files/94480613238.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b57cac3dc6---68809270111.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075bcf05f705---12243071280.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3045de666---vifedenuniziwekose.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210528082936.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/60636852151.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/keviragabulaxu.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/86386375309.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/wokasexupepagevewovex.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/xumik.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/2d65cd83b1b834d2e16f3181898b8946/54098572913.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fe15be5d59a96c62107c2bd55a19fe20/37161599664.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/dunuwebasojomasumolimo.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/wuxudi.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_off0000e59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 18364 bytes
SHA-256: 93bf106dc200c10ac131386f124305281b1e8765b2d665bc8bd9e68b2d7deb07
font_01_sfnt_off00011542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11542 10600 bytes
SHA-256: b802b23043b6bc722b5eeb1ae244f3a8daa5364e3a206d46fef59423705c63f0
font_02_sfnt_off00012d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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