Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfede2ccbd4dab94…

MALICIOUS

PDF

84.4 KB Created: 2021-10-21 19:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: deacc7d0cacc899c02f593657cf4e645 SHA-1: fd53861135e81b26fe9c518fa442288e22392cc5 SHA-256: bfede2ccbd4dab94a3f5494ff72f8f453d24ca9dfac16e2cacda3f04193700b3
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external PDF files hosted on various domains, suggesting a link farm designed to redirect users to malicious content or phishing sites. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/advasraa2bq8n56k3kq971rbh6/rapoxupifumif.pdf In PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16163512d09940---84696882396.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/xovatewar.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210918035353_dti0gp.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614673b670455---wivutakofipatutakafazu.pdfIn PDF document text
    • https://petikdaun.com/contents/files/93129145396.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/21643004525.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/vutowoxowegefidute.pdfIn PDF document text
    • http://reestr.fgosvo.ru/files/files/zebiwogatude.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/37143437312.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/5453731475.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/girune.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/78156462734.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/borebe.pdfIn PDF document text
    • http://htwy.com/upload/file/43447565031.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/97648792355.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/80467959565.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/woxikosoxodazuzolemo.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/navazozifodukenof.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/8848391317.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/21567758699.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090316522417.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/7xhmvLXWVJc/uplcv?utm_term=what+does+it+mean+to+youPDF 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_off0000e87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87F 16936 bytes
SHA-256: 81c84796bb1a471ae13f7ac6c08daa363e2090bf6ce9e796b7021efb6d35402e
font_01_sfnt_off00011459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 10572 bytes
SHA-256: 6478a3047a46d061ebdaa2c9c1f950854b7506b7173bee49f705126e61e55e70
font_02_sfnt_off00012c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1