Malicious PDF — malware analysis report

Static analysis result for SHA-256 916b4412d2604cc3…

MALICIOUS

PDF

101.9 KB Created: 2021-07-30 19:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 73539d8a77a2061f0c85707817a3e7b6 SHA-1: fbc1f69fd2ad19c04e0e73ebedc32f6d7cbd3174 SHA-256: 916b4412d2604cc38f0de38f88287abf6694a2a7a5f5b42a631e852acb9cc690
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, are part of a larger network of links designed to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/8msu893lbr6hrra71u9b2jaqsm/lekunosiporoxope.pdf In PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ff17b55f4---39488993051.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/30cb506c09a56139a13af9a7eb018256/jijokaxefo.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/pokekusebinujaradamumezag.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/79218096201.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/jaxumolelubovanetodowof.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c90459f1983---vejapuv.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/lirubebobimo.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/8e36a6b79be66c59e8bf7b5e143d8e37/43917511819.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/77607023524.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0665985e82---51000271226.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/tijirunemejonedurone.pdfIn PDF document text
    • http://silver1979.com/upload/file/wajagazosariwuza.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/wimofugadifofewos.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c06919b36---89882904418.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160fe75cdc1acf---12788483309.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/monelekilimul.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/96409776891.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/66072088714.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/d83dc30234e44a2a547a8a71e24ad519/topineleseri.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/25273c7eb0ccb110cbaa97381c44a573/viwuzota.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9a19b7ed7---sawijejazubuwofibuwujag.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/62724259202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=oxford+picture+dictionary+english+french+pdf+free+downloadPDF 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_off00010e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E23 16192 bytes
SHA-256: 97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd
font_01_sfnt_off000123af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC1 19164 bytes
SHA-256: 09491f0a7cf4538281e42787ac42a5bd6f142387c5c98cdb1bd2b201991897fc
font_03_sfnt_off00016c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C75 11328 bytes
SHA-256: 444927ff651f27355a5f8ff69ade071c500a1628df15cb0bbe083563d0a770f1

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