Malicious PDF — malware analysis report

Static analysis result for SHA-256 fefeaa0d48eb987f…

MALICIOUS

PDF

159.7 KB Created: 2021-06-19 19:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e6e47bccdf31a6b20cb91b6cf79fb20b SHA-1: 274ddb1fd92cf7ae7cbd574c3c8020dbeb851128 SHA-256: fefeaa0d48eb987f63d114d26b047d537ea88ee5ee07b26a5f3679ee38d7f444
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body contains garbled text, indicating it is not intended for human consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://aimic.com/userfiles/file/rabegikuzagakuboxijifes.pdf In PDF document text
    • http://ahlhy.com/uploads/file/151841266431.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bc55d8cfa---pemagofi.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/jurajovapetizozobipen.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/sowoje.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/xanexiruzifi.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abfffbccf01---42549753130.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3515fe12f7---40821612270.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/59239511985.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ea80a65f4f8ca11ad478c7a8721eae74/49812924400.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/vpuh7ps5lrs9s7cib2pebp8ue4/91498524112.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908d5b4f170---81789135636.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/zogogomesat.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/12923470130.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/441b780b9dd058e1e4eea91273a1ab44/95007257195.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ca91660d2---lowizejipezikuzikeburajuf.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/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=wii+sports+iso+palPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21277 10172 bytes
SHA-256: ce9ab091284a0897529881e789184346af0141163f3fff54dac6110ab04b3782
font_01_sfnt_off000233ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x233CA 4824 bytes
SHA-256: cff19b94ea23a34465aac2f81b3647a98f029d414e54885682e52e951c4045f3
font_02_sfnt_off0002444d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2444D 14672 bytes
SHA-256: 454829ba7a2d0e038f36c6e2d425134b7cc53bdd68f3da9b23d5d33c58c600fb