Malicious PDF — malware analysis report

Static analysis result for SHA-256 8253adaff0661d96…

MALICIOUS

PDF

72.1 KB Created: 2021-09-06 17:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 05cfd7c89c7d5c13e86b3bb6c78aff3b SHA-1: ba35dfe043f87c4f7ad2554d91525c45ffbcc6e4 SHA-256: 8253adaff0661d9665e3c0dcbb13508fca9190acad3e1f49d045d33795fa759f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, specifically within the formcraft plugin's upload directory. These links appear to be part of a link farm designed to host and distribute other malicious PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a202b1ba477---gutamedanajovixosijewo.pdf In PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609de714b2336---luzuf.pdfIn PDF document text
    • http://matthewsmillsreunion.com/clients/c/c7/c7863f7b93cb17915b2a89d887155530/File/78182671436.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/9m6f06voksl5ou4a4so7rsp4ov/62568115545.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ahbs5731g8qg50msa0gjrgimr3/jufozisadevup.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/kixiviwo.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/surezibuxobupiravaga.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/i0lketq10u66fqdv8mp7thg09m/kenakadinigosiramijagi.pdfIn PDF document text
    • https://koratspring.com/upload/file/57333106718.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/be7f2a98acd590bc13e5c6e2bf90080a/modowawezexodaluwebitotu.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/lolivekokaxafajabumilakoj.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2399cc142---9945208722.pdfIn PDF document text
    • https://shunnasato.com/xamatebibefujuf.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071a5baf1113---wotekawawedokazilak.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/metadogap.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/43274355374.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/dovurijivubakufu.pdfIn PDF document text
    • http://jn-zhsc.com/upload/40429038773.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c85930db0e---98270290875.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///84643331115.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/75581824675.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/qlue28u6vrgh3psfmmf6h6kmnc/lodula.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210627205044.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/79371867827.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bbf43c819---50318898809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=lucas+manual+transmission+fluid+additivePDF 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_off0000b986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB986 10760 bytes
SHA-256: 24a64c828de7a5b858e3094819f3dbb17191dfb51e3b2f18883ed48adeccf5e9
font_01_sfnt_off0000d24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5C 15804 bytes
SHA-256: df00789765332462fede67da2d2f8b7c351288aa8d5d983e0ca05544c510f7f1

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