Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dece354245e9f3f…

MALICIOUS

PDF

86.7 KB Created: 2021-08-09 19:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 96dab3ad675ca252ebecfe77102f72f5 SHA-1: 8e86e09c9f1d1618f7c26b4a7ae378d12f2cce5b SHA-256: 3dece354245e9f3f16eadd399ef390db16bab8053bd87d8d912893cc3368d07f
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier strongly indicates maliciousness. The document's structure suggests it's designed to act as a link farm, potentially for SEO manipulation or to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/dc7b76e96240ab699101433380da2653/72473804336.pdf In PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/35013494161.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/gevatumepizuxakew.pdfIn PDF document text
    • http://mesterek.net/tmp/wesonezukurodexogozukoju.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/10970171178.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/ed25374ec224a3b07e00e5581472398b/62559006363.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b0a53af6e---muwovolezuku.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f8d1819ec---56673197546.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a268083474---71421326053.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/jogekukawamamikas.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/rabudijituwiju.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/raduwo.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084500ca9658---17567790639.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f91d5f42a---timevasirezugovoxinexupa.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/zumobepobolitox.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe9cdcd8f0---zozarakumokabavuzetap.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16110ff2b6bc02---54801062862.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0d01cd06c---mezogerofisisir.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://mwflower.com/upimagesfile///vilutolusiw.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7edb4cc6fbf28613d0134081af0c345f/ranadadotin.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/50032386492.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/56878196690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cuantos+kg+de+arena+hay+en+un+metro+cubicoPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10508 17836 bytes
SHA-256: 4da019b365bdbf8d5b4edb47c6c5a5f97bacec859874193078104cff2a890460
font_02_sfnt_off00013299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13299 11248 bytes
SHA-256: da5de55006b0264f24695cd088de9a13f383f1b74eab86389a2d435e2648cd88

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