Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef4e81fa378006e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 20:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8d54755f4da627ac0ccde9c273184d25 SHA-1: 2f0c8430c38055e5841a86a902cd8c6025e8484f SHA-256: 4ef4e81fa378006e2436ccc45a3bdb7bd962aff6940af56584c1b766f13e3577
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 indicating a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to redirect users. The presence of these links suggests the document's primary purpose is to direct users to potentially harmful sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://futurefacesmiami.com/uploads/file/28670107690.pdf In PDF document text
    • https://bluza-shop.ru/content/File/xoxaxorepimulibu.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b03ca02138---81336093756.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/tizibok.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/1987538006.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/nudejigoxoxow.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/1e94505f8ed2faa28403ceb597033a09/14604333678.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/76401688819.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/lowopikaxigegurujebafati.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/3079159749.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/49376449137.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/duwedekibuvizol.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/16/ponabuxamemiborop.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/sajusamoxoxipoxu.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/9863562966.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/wudenudun.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/122009306436.pdfIn PDF document text
    • https://shevian.com/images/file/kugezewudarazuzelinabe.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/jozito.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/50622617981.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161351a13eb85f---fikovetunuwagisekasasorin.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/24505916624.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/52449658131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=best+photo+collage+app+for+androidPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/gesapafebefixu.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_off0000dce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE7 10952 bytes
SHA-256: 1aa696befeea60babcfee0305834ed382e4601ef604aa9a4d26eb9a1ba23b4a3
font_01_sfnt_off0000f610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 17572 bytes
SHA-256: bee5d8784e69ddcc53a434aae4771a108186c0f01140540d87853f03b07a8160
font_02_sfnt_off00012356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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