Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d80f1933d3073f…

MALICIOUS

PDF

76.6 KB Created: 2021-06-13 05:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 27aa485c38b7a61e4e39105cb3fedf78 SHA-1: 73a1a1ecb9aac670eaea3ff53fe1a12a8917b1c5 SHA-256: 77d80f1933d3073f2087bc7ea43afaa151a5cda23e09a266a74e53f929117323
96 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and URL patterns suggest it's part of a phishing or malware distribution campaign, likely using embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cructi.ru/uplcv?utm_term=english+horror+story+pdf PDF link annotation
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/j87mk5ldina3vpja5aug58d430/37573297185.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609da8e2a637c---49847028101.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/zunaworozazef.pdfIn PDF document text
    • http://ore-processing.ru/d/files/fovigupanuzedekegi.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/visitanabovojufarakesuvaf.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fc5e6645e---xisixejatesapuvavuvofoni.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/attuacqje0ap67nui9i1l96633/64992328849.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da9e3cb15f---8626283065.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/puxujexogakodidej.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/033c2962273d3918f79f79390981bdce/mikik.pdfIn PDF document text
    • http://c-amc.com/upload/files/durokejo.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/5e9i84c9i353odm0pg4scj1fin/30075389133.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/70a015534946132227a8ac9f01bad2ef/75171948595.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d352fec3a0---41492183272.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 5152 bytes
SHA-256: 6ed94dd48a0552f7019ee36554b12be29e973b209c018f64e4d8dc59570d4bb2
font_01_sfnt_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 10688 bytes
SHA-256: ee76601aa7cc4e5292aa4e384c9f3bf6ff063a6cbf7240b72556dae9b9c49c76

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