Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e1db28d04ecfec…

MALICIOUS

PDF

73.1 KB Created: 2021-06-12 21:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 34a7f3af84edbf108b24ee56517fd49e SHA-1: 405be80211789e24b7048b4237eaba94c069f10b SHA-256: 35e1db28d04ecfeca2a66773b7fba820a74b5e6b85c17586a21643fdaf36681b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the presence of multiple external URIs suggests an attempt to redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution capabilities.

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://synerhu.ru/uplcv?utm_term=psd+gaming+logo+templates PDF link annotation
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073df75a73d5---kolavez.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/begesaruruvinoseferagemas.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/26c8f9304ee1c2e87ec5833e3b262764/lekaluzodedimopone.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/35570738861.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991ad1c47d5---36842514655.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/2e31cd8672b645a9f741f211cccb58c7/bozaragivoraror.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/97551348377.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160762776a4226---gegufavarobuke.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/bifusolalenufowenan.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/4e3f14894dfc9abdb36f693b606414a1/safafibamixe.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4ae9994ae---15829813744.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/mih4g8i36fb9v0uqh6dp01qs0l/jijixexajezepekuv.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3143f1fb26---gatap.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6d7bbeba9---fuxijulelikogegug.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/6513c9d9ff33087450d2cd280705feee/nedafunudoro.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/xalojaxodazosetomiwuniw.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_off0000e154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE154 5184 bytes
SHA-256: 10e1f0bc1ff36bd78eed0ffd4cc25547a302dd173770ec6b4fe7a20db4c6836d
font_01_sfnt_off0000f2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E6 10696 bytes
SHA-256: 2c12fe1fc9a344b6f7d2eee2c80a11a77b179edc399db503438132ff8212ee4c