Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ecc5f0be660a4f…

MALICIOUS

PDF

87.7 KB Created: 2021-08-21 15:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b583b0335814eefd0e55095c504b260b SHA-1: c10723b3186114fadf0c30c561d1c381e75520da SHA-256: 97ecc5f0be660a4fef3e9a783608a85b52d6d6d69f1ed072622bd83b4c76bfc0
96 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised websites and potentially malicious PDF files. The ML classifier strongly indicated maliciousness, and the heuristics identified it as a link farm on disposable hosting, likely intended to redirect users to malicious content or exploit kits. No scripts were extracted, but the structure suggests a lure to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://vietnaminsight.biz/ckfinder/userfiles/files/37135098957.pdf In PDF document text
    • https://samngaimarble.com/html_upload/file/74981474122.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/95778546941.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/25439ff3b895cd44e81818300ea0b465/77700245675.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab855deccf6---72343758712.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609258de34674---rojerixoxaxibase.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5ce9f107fd85b6dfdf4d1e2ba664fdec/xatosekigafegaja.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/melunevivigane.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/64264770876.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/39947edf198b9520fba378f854511783/33655906079.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/winanifekodunasawefed.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/gtt0nnk6eoa2m61ijbrm7a0spu/widasap.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210718221921.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083d39e6f430---gegilusonitex.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/vifidimanudakun.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/56273759237.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f09eb2ad9b---94345490535.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/zulafasumenipi.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/629be150b0cbaad2b4bd3f8f3e14156a/wemobi.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16071f69fb69a8---fixezijawuxetefex.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bec9d81f426---49657665050.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/98f036be82e6a3771783488cce8ad0aa/2715679262.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/zigasifir.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/80648643876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=libros+gratuitos+de+la+sep+primaria+tercer+gradoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD629 10952 bytes
SHA-256: 68cd50e48678abfbf97654852217893770c4510566a8f1719b6abfd8cc9ef5a4
font_01_sfnt_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 18304 bytes
SHA-256: 5c14012fd2f6d176e90931b287c4064e7c3445c3b99e2234acd16331f48f047c
font_02_sfnt_off00011df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF9 16688 bytes
SHA-256: 617edd3af74cfb5774cc8738c5254c650a72e7d0fd9d3cd652a1fe4e8d58bde2
font_03_sfnt_off00013581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.