Malicious PDF — malware analysis report

Static analysis result for SHA-256 6626feefdaf1107e…

MALICIOUS

PDF

109.8 KB Created: 2021-06-27 13:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 847e300a94eebe929313896d16bde0bb SHA-1: ac68cc827c326808308ebb83b77fae06e4da9d99 SHA-256: 6626feefdaf1107e6076fb9b89f16bdffa5c78e2f4807bf6ebb5d3681ffc50ba
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 embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to manipulate search engine results or redirect users to malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/e5d3692f506cde92d9503a068987c685/78061928408.pdf In PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/c4c7jud9hgidf1hjljcck3ca22/goxobijanusifise.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/sunubo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/57559da6fefbaecc0d8ae6894fbdbf61/dumexoj.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/1c57155743ab60970b867d39c93c19cd/kerupik.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609094e5dcd01---81030584220.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/5911f94fb94aae76a6c25f49fec7c8de/70112215035.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/nl8t8ikqci66949t02f40e7tvn/vejekiwaxila.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d76ae0a637d---mimelelavisilofilitijitob.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/sj30hvig685gnupcbc4h5am1b7/69481348227.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/28274163880.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/951e526a3e0d3fe918ae0b44e194d02d/73525778426.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/buxibebapoxazuveg.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/bofibog.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/d8f7083864d6affbd3dcf6177acb070c/gubugixopu.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/1778614151.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0476dcfd9---5166239224.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fee69f176---xorot.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/2342096913.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/67969331ff61240ff8bd13e800c1d7a5/48030825265.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/fb965b1f7ffbe4c4bad8eb9aa1a93b5f/wexosilarurixoxipomuf.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gocpavmc7qjr60aaco7ld35a60/3078157587.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/10413898725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=yugioh+deck+guidePDF 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_off00015218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A2A 16196 bytes
SHA-256: e06e41e9f6646e0e3ae6e17f33cfa64d1fea625208342f00d791992999a64d85
font_02_sfnt_off000193a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193A8 10148 bytes
SHA-256: 5f72f3b10478a40af4caeb45fb9d2b949724b89828ee8884756df6c54a02df36