Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e8f0ffb86850ac…

MALICIOUS

PDF

80.9 KB Created: 2021-09-01 16:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5d0efe7d43d894d0d3c16b76b072d11 SHA-1: 16748bff86f9da7bab9f2cc9bfd0d6cec35a4014 SHA-256: 11e8f0ffb86850ac1ef6f2edbe255be6634ec4764ea0ad79f1cc16b95ce40b60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://inwebjor.ru/uplcv?utm_term=average+cost+acre+land PDF link annotation
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f11241715a---7570566017.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a988b408a0e---ganalape.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/nifanugogofetuxezeruzaso.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/tarezedanakumo.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/77487592845.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/rojanoromuxetuveweropizot.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/36cf9j3vvahn1stlovod7k0fg4/sanada.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/f6lalkhb7sb050crgs6se4g7j7/41103532782.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/d2685765f0e10c018435d7b38cec03a3/wixibiduz.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/bkjk7u7o75e3kalnl3eijhen0t/vamodojadig.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/dirujuki.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/50838072195.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a0d789cd0---88691040384.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129dcc40628e---wubimezovimetew.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/pevapena.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adfcae90808---xadozirubuli.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/58564568391.pdfIn PDF document text
    • http://newo.ru/files/files/joxewapixofujeras.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/meuksko6qdnn8m180l188ulmcv/53697726066.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/6fc2dc9b9e66ed9cd1e89408cf8335ef/mizekufusiposu.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/13d11807f11a7bc93f5b2aeed2476f8e/pexebadapetepanufaz.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_off0000d816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD816 10500 bytes
SHA-256: d5f41090e9c1669d18dadcb75ec380a5f1adce48e31eaab1bc3284c9ef62113c
font_01_sfnt_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10808 17832 bytes
SHA-256: 13ba87fd517e0c742b9de6f23212793a9a92ba404ce57f31a17059c0104d93cb

Open this report in the interactive analyzer, or submit your own file for analysis.