Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ae47dbd9468ebe…

MALICIOUS

PDF

88.1 KB Created: 2021-08-01 04:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a1f513b21bddc88f7a05bf591e80ded2 SHA-1: fae328e01bf8472d84692ca5d511c204570c03bd SHA-256: 28ae47dbd9468ebec035a2b5de9443b4aa85dc17a71e8b5196b3e122eb1214be
196 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a browser extension or update, a common tactic for credential harvesting or malware delivery. The numerous embedded URLs, many pointing to compromised CMS upload directories, suggest a broad phishing campaign or a mechanism to host malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://garglob.ru/uplcv?utm_term=why+google+translate+is+not+working+in+chrome PDF link annotation
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/9a4749087f325e78bc6e16aec71f2fbe/38857701173.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608edcfe21551---69656109197.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/7836562005.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/84689879611.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/57061493408.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/fb333581593b4e346c45cc93de55b68d/vijukerukedifaduxatof.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a20cfcb2231---laxonemabejijetit.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/falebifijalalanudaxog.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/dejerezatowoxojilasupi.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/gomime.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/84e8d9a9746810f4db59e03f9d161416/muzitarosozidisulu.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/texofadorarupe.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/tegebujelesoma.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/48978013401.pdfIn PDF document text
    • https://ip-pharma.net/data/files/75507519292.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607af6bf10c8a---tegezezokabibe.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1iib3dm9kk113fhgf9qdqi86s0/87639689836.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/54876775922.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c586a7723---10660585245.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f055e434a72---tilakegarotafikarez.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/35456825909.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/zopedokaruk.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/51048791717.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_off0000f563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D75 17092 bytes
SHA-256: 5c8de43f2a01b1b2f3b2034810eb5f4eb8d9fbfe9d1db0207983a3e51401ea72
font_02_sfnt_off0001397e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397E 10960 bytes
SHA-256: 73c207ad7634cd50f4f2b42fe3f8169301700f5f66150912563127513e721970

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