Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff015bda24a891f9…

MALICIOUS

PDF

78.2 KB Created: 2021-04-29 00:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 20b379da8aab5f21aa1c819360c892f6 SHA-1: e57d0c00e1fda88665732bd11327864fde462a28 SHA-256: ff015bda24a891f90348513322aa104bade9cbdf36f64e4049e649317708b11c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains, likely to distribute malware or conduct phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, potentially leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/f513b3aa8d4b22a685634ae8bdedd4fa/vulazedenijaputimewilesi.pdf In PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3aa2a981---59678709543.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/dmacjmqdg6lf77b33itl5nob45/piraluzasumewimiruvox.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a80247a0---jopinejewajalorinisetam.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16079c57f4f320---84706016699.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/2dd783fec5c3c54bede7adfa3d56a73f/7124279168.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/8fe2ad9d718a62d429186402812f5b65/lutasopugazodepozumifog.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/5c77abukdibrkndhaq46aodnu3/70784522597.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9865a9245---radutuxuweb.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/e10c4bf9682ea61c0be61315d03fb8c6/78623306405.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071c756a0de9---73048639773.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/5af3db0f1aeb0dcc45938d8b5f913470/30155256827.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa7eac282f---88047632718.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf2680b8d1---43944677634.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=plant+and+animal+cell+foldable+answersPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82F 5400 bytes
SHA-256: 0aa256ca10be3489f110f86447cfa96082eebb97bb74967c74aff910c81c0e12
font_01_sfnt_off0000fa8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8A 4012 bytes
SHA-256: 0d3ab16603edbfbc8ba47adeaabeb72623f78c126673b6812cea2bc62678ed0b
font_02_sfnt_off00010719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10719 10476 bytes
SHA-256: 790f6fd7ede7e0d043a5c24ac5f99a11c35172acac4e39c27070b26cb6ae0fbb

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