Malicious PDF — malware analysis report

Static analysis result for SHA-256 93fa2deabf96fab8…

MALICIOUS

PDF

80.0 KB Created: 2021-06-17 00:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f47326fe2f0076a642e4104d87cc7a46 SHA-1: a855c2a573ee0a065cd8f189d866fbcd88f039c1 SHA-256: 93fa2deabf96fab8004b3811896b31e3c0d5b7f9ecb8fba1ead51b32f2bbcde1
96 Risk Score

Malware Insights

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

This PDF document contains a link farm pointing to multiple external websites, many hosted on compromised CMS platforms. The ML classifier strongly indicates maliciousness, and the presence of numerous URLs suggests an attempt to redirect users to potentially harmful content or phishing sites. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://drafthe.ru/uplcv?utm_term=dimensions+of+iphone+10+plus PDF link annotation
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a199ef5afcf---94974580736.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210607_EEFDAA20F965D7B4.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/86c3c25f081a366372b228b48b5f6836/lenofutudesa.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/163c40905d56caf53a4d7445064dec69/kugabukotodino.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998805969b0---46474553568.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96318eb159---98968143655.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/92789076164.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee18e5e77---3003054645.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/67572544129.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/249bc7b91ec9f5551beeb1b47d468234/vifenuvusijewadagamo.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/a126db8eb092168fc60cf8538b1213d9/83453955062.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/votugupis.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/jefosovimigisibikidap.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/tefipus.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_off0000fd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD32 5028 bytes
SHA-256: 57b858656bce45947a279daff96931547c72390f70923e68d0a30018ac36a25d
font_01_sfnt_off00010e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3F 11020 bytes
SHA-256: 3029cb94d203dd5f371b827b7539da6f3b9c00e07817836c17cc9ce240a2d713

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