Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e88c053ed20afc…

MALICIOUS

PDF

60.7 KB Created: 2021-06-20 21:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 2b3f7e19b9efbf05d375afd5514c8783 SHA-1: 1551e3230ba7b0f5a792ce20b6bc2c6c19c9661f SHA-256: 93e88c053ed20afc309839bd2773c7b1a6d339602d9592ba7f1fcced4e504971
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160791e3a297b1---pikasava.pdf In PDF document text
    • http://www.jindatunnel.com/up_files/file/52648336985.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/mewoveviv.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/mebolozolol.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/8347124368.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d4ce8b3e15a9caeb172a21405e19cbd5/31533647542.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ccd606e5063bec7174882785c9d980aa/94683611011.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/pemune.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/pii5b8p5n36ra6oo0cl8939619/fijebekumuv.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094a41e334d5---88829086485.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe6b97fa9c---vogobebejizadijonubes.pdfIn PDF document text
    • http://abpaluso.com/upload/file/3073111883.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/89785325316.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b3fbe158c34e667cda6d57b000451799/97315219388.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/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ssbu+all+charactersPDF 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_off0000b23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23C 5128 bytes
SHA-256: 07f6cccc966d4ae09457674fbebb3378392724fe02097f6ea2aa576755cbd061
font_01_sfnt_off0000c3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A3 10088 bytes
SHA-256: 2c3488b2371e7baf696af41c1d06e4ef6440cf138b83d23549eaff4bd18e13e4

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