Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a617f3bb6fae755…

MALICIOUS

PDF

73.5 KB Created: 2021-06-18 23:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 93884ced0bd3c1bdd4360e93c3f5b160 SHA-1: 1828b26c55c0bd2f619d56ebeff62f952d532331 SHA-256: 3a617f3bb6fae75527d8e432d3ea7bf0ed60b6829919249c553b19c536ddc8b8
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple external websites, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs further supports a phishing or SEO poisoning attack pattern. No scripts were extracted, limiting the analysis of direct execution capabilities.

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://irish-setter-zucht.info/ckfinder/userfiles/files/65456165991.pdf In PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/e7ige0a7cgo2hm441s31l6d052/bedalokuxisirafo.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/pijoz.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fb5676bdb---44960859131.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/89035604501.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d117c304c1---86648961517.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/746145565370ab4babcbf84bd8e42f0d/25084246919.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ch3k21ntq4gpu12invvn7r4dq2/wajoxorajabuwogezaf.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/mawipebobudiburet.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608233205d625---kivatixavo.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/dawabanarasivasufule.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/jejolafuvinati.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/nexixanipiminumosavalumuz.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cffe231ff---dufigabesobuni.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aa338d65839---88190473747.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/a0ivacvp7pg5ceq4bs0s8elrg0/vivixifosaxowurorapokigim.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/PmAiG5ZyT-k/uplcv?utm_term=past+form+of+the+regular+verbsPDF 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_off0000ddef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEF 5384 bytes
SHA-256: c5d4f879f50c52595b7d2e6e3106be7bc3b64df99392473432a16b4709a523e8
font_01_sfnt_off0000f01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 12680 bytes
SHA-256: 478ea2f27545c0a87ef7d299e1e89d55c3b328cd4ff90f70d33707ac0f91ec4e