Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0e3aeffba2c1ca…

MALICIOUS

PDF

90.4 KB Created: 2021-10-05 23:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fa1722e1f0730efdfbc213958a26eae6 SHA-1: 449e5adc1ef737ee87cfe94295567b612880a284 SHA-256: aa0e3aeffba2c1cae21a7725c8b92fbf5ccaf00b6e6a8e24dbf1baadb6b60712
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ecowaytechnologies.com/ckfinder/userfiles/files/ziseralosaguxirinobupimek.pdf In PDF document text
    • http://finance-bulldog.cz/UserFiles/File/jepirak.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021100112005114.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/sijabeterug.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/koxug.pdfIn PDF document text
    • https://tavio.ru/files/file/43115781041.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c19b62c42e---moguligavavixogenojefeke.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/26157153271.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/xekojokolilonomaxo.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/19372092182.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/rojelorururim.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/tupoki.pdfIn PDF document text
    • http://farashimirooz.com/files/luxezebujeb.pdfIn PDF document text
    • http://salt17.com/userfiles/files/2849968561.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/surumozusuvunenilipi.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/42c217b3994f359fee692f684c6811de/47343104492.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/wokidegulinux.pdfIn PDF document text
    • http://sjhtractor.com/d/files/dazowanaravog.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/duwudatovapopazaligije.pdfIn PDF document text
    • http://irinabailey.com/upload/files/52572603581.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/budalawobegijekan.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/85238254140.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/panagidi.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/72cdaaf87316bf168dd0fd86af642ca6/xuwebuloz.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/10758848665.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/sdg7crceqlkkucbls4eqffc1ea/deximujalotirazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=transfer+pricing+multiple+choice+questions+and+answers+pdfPDF 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_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 19888 bytes
SHA-256: 3aada3e3ed002d119e7fe4461ecdcc400ff2e25106a2c11828de99d9e9b16f63
font_01_sfnt_off00012861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14078 11364 bytes
SHA-256: 7b1f56acd1ea7c5064a44fccb673de3044a0033f308e271cb7a8eea0a635a59f

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