Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ad76de556f0493…

MALICIOUS

PDF

75.1 KB Created: 2021-05-27 23:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bf7dd999ec3a9cf06bd86268129f008 SHA-1: c0a6171400b3e173e4b83a1664746b00439ef737 SHA-256: a7ad76de556f0493c4047d73fbfc5fd0b7b6f350839d063ae49821095ebc687a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages. The PDF itself appears to be a lure, with the document body containing text related to 'grade 7 math algebra worksheets pdf', suggesting a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6c9d3fa55---42905247244.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf64fcaff1---40599969645.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/74ccae90a07e8cfe82cbb88a780b0abd/55891987707.pdf
    • https://allcreaturesinc.com/files/files/45374327357.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/73565c543e209cc4bc83ffb4366a2186/vozusow.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/kamalopetekekulafozun.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/0bclbgv3l333kh8736rgtkjdrv/64532542682.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/aa4c42d1ea55f079ba59b05ad0b96694/xinuratevuxorabog.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc20775117---dasukinedazamudo.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/99m0js3gm0sfjht8rbh34fch8o/45130346992.pdf
    • http://al-bandak.com/userfiles/file/13262216265.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4eee9ad9c---57795980253.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/q24hts8353et91b9sp9srnad75/dadimunetutilegumolag.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/e8f5e648d856b82e6c08e17c58ab6bf8/luragatiwagenokumufakus.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/2bdde0f2b498d966bea7f4cb75092d2f/firudovijo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=grade+7+math+algebra+worksheets+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5c5.bin
ca29656e82594451b557dd1f479a927c19d3f53285e814be03e960481429aa35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C5 5864 bytes
font_01_sfnt_off0000f9b0.bin
c1e88970fb844b3cc0026985dbc9dc3bfc0bad3d4e6038d71160d2e3a9bf054d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 11064 bytes

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