Malicious PDF — malware analysis report

Static analysis result for SHA-256 dadccfebd4666ea8…

MALICIOUS

PDF

114.8 KB Created: 2021-06-23 06:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f229e0bdb228934f06e5d24ed921beca SHA-1: 702a7e17f5be6b82cf880f982b1cce65a593f5a4 SHA-256: dadccfebd4666ea8897650409d9ff42ca34a5a2f30050dc4f5a401ac2b318096
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness, and the presence of multiple distinct hosts hosting PDF files via form-upload plugins points towards an attempt to distribute malicious content or manipulate search engine results. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8bf243494---48437291241.pdf In PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/69489889184.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607119b3b843f---2993470320.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/03efbf2762ddc018877c96c2a2fc94b1/zababasubobekolupir.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/02c619b947fb62969043142e3b46a4b9/41752092157.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f3d24b614---rizikizolawesarikixugovut.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/fixanodesunon.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/76294285808.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/d4f4ca1368f8efa35200cdde1c980de6/40185081979.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16083d087e82a8---6781640788.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16087e7ad36c21---94248893963.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e70feda4e---51665243061.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/pm9phmbbshifedvdbiqa0e7gqd/tojirakasunefaw.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/be9205025023ef8f4a13bef9cd38e825/kazonevaxutusowu.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16088dbc599719---menalurosirasovo.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/21b7574d3d563cdb8a2802f74f7abb02/6128285937.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/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=integrated+circuits+and+applications+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18243 5260 bytes
SHA-256: 2c18c6e149f52eebe4321a42874f2ad702e6e8395e912a25772da80c063cfbf3
font_01_sfnt_off00019438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19438 12820 bytes
SHA-256: edfea0fb3acd041d0c2a04cb8b371ce73659722835c384fbcc1b7bfb9b41a4fa