Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5d3d82e0f5bd8f…

MALICIOUS

PDF

83.1 KB Created: 2021-06-11 11:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d3399b46bc3f676db3db481339cfba09 SHA-1: 2472eb7257b048bed76d0dc7dd42aa98becebce2 SHA-256: ae5d3d82e0f5bd8fc7d24707544cf113be99e84c5c4541495a3e1de29e001f15
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the heuristic firings suggest the primary purpose is to direct users to external, potentially malicious, content.

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://catamma.ru/uplcv?utm_term=kendriya+vidyalaya+admission+link PDF link annotation
    • http://tivatijapan.com/uploads/userfiles/file/98876476810.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/93661028672.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aab7f1b4f82---xiveluzinevuwutetalo.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/59362218205.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/sodok.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/xaxixitapuz.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a541b4ad82a---7292918284.pdfIn PDF document text
    • http://surtek.biz/image/files/20150115_095646.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/0a2820fadcdc8f91a15f0d00e7a71b91/9644831191.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/41441352490.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d582822097---79748522087.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/kia74fip1mfujmljip2tmg1u0q/dujitut.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/52d6b1a183583d26753bd9d5fb38e321/zibatimizujuvag.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/moturulubitibuxigilan.pdfIn PDF document text
    • http://indel.sk/userfiles/file/64184548724.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9cc894c48---17923586075.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_off00010836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10836 5164 bytes
SHA-256: d26d4e57aa10580f9dc811e527ab739ea842d11709b1b53e8bde7011d7ffd40b
font_01_sfnt_off000119ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BA 11084 bytes
SHA-256: 3ba8f9ca825d5f2b6f2bed58f8e2ebed0e6690d8c6c1d9870cf1a84a2439f711

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