Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8698943bb3440fa…

MALICIOUS

PDF

84.4 KB Created: 2021-07-07 23:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5f620904f3cc828d621be3d276e5afee SHA-1: ad334c49692fe88382ffac9d65b86ac6ee588a1b SHA-256: d8698943bb3440faf699de06227aa6ac3c9c60e9fa69843296b9861228426439
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, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malware. No scripts were extracted, but the link farm structure is a common tactic for distributing malicious payloads or leading users to fraudulent sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/iqoo1l4fruakc1b1j45qnll0o3/fotivugotox.pdf In PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/k13uogo1fli52u6v0t0kq26uuk/42752545557.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/544b4823a4199d1e29ce1c482c345bd7/korowejuregur.pdfIn PDF document text
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/14169885497.pdfIn PDF document text
    • https://bio86.net/fichiers/92872283859.pdfIn PDF document text
    • http://wrhsclassof82.com/clients/d/dd/dd94ad2327da436b0bfbe5937c3cc641/File/22579872884.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/er5i5fm1f5tf2tgtnujr46kq74/88214605559.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7b4736a34---14325059336.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/7a7cb6b8ac3f1c50392629cdfb047fe2/46811590441.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b17ff02f257---vojozoxadapiwaxabuwa.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073eca8a4056---razawero.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096944c04fe5.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c87b8a96f43---48799962831.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8d8b4180974c704a0eda36749f06979f/tezefupu.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/21816732790.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/95038820308.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc94e60927---ditekivefo.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/56865724600.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/lofavawikutizeves.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/71421878518.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/ravebofib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=baby+girl+funny+quotesPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 18116 bytes
SHA-256: 93dfcbfea6e1bba6f55557e0a68955ba49ef1903f78734924be308901dbb4cbe
font_01_sfnt_off00011391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA8 10944 bytes
SHA-256: 306f9233a74301a619517bac5dc036556a283b8857d1282dfca1d1a8f55b00e2

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