Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea0b59bccb2c569…

MALICIOUS

PDF

87.7 KB Created: 2021-09-08 16:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 51995aab8b7ab89429ad0455a342cd45 SHA-1: 0f5bdc320763da4377a71b364c179c8afa8800fd SHA-256: dea0b59bccb2c569f45591bce49e27ac17286e6831fda2635ff43751286feb58
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/582a958a88890ba505932eb8a065b62d/difewapajogawupa.pdf In PDF document text
    • https://whatshoulditcostme.com/userfiles/file/jorexa.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/0sddgeljk48sqenh33669970ra/zilati.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/1528785321.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/naxavidalijavalotopeg.pdfIn PDF document text
    • http://protok.pro/upload/files/11112194218.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/tf4oou92spk9q03qtngr1hbdov/gasuzexatuse.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/fudawafutemaluworogedo.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/29539046325.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/giwulewelega.pdfIn PDF document text
    • http://onelove.cz/file/tujorob.pdfIn PDF document text
    • http://kes.org/upload/editor/files/rutitikidup.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a5ff221ba---22877024823.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/25418592692.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613082df551f4---gavomirifisisopaket.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/29904260564.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/dawuwolinewukezokatawojit.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/52844928173.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/45879586878.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/sifuvuxagepakitanad.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/wowisalaroligidenim.pdfIn PDF document text
    • http://fabtur.ru/upload/files/43519961439.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/34031338288.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356fafeb8c0---92672598117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=pilates+exercises+for+seniors+pdfPDF 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_off0000f414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 10716 bytes
SHA-256: bfeeca98ff910edd81db4a313a85ad5644d0c689cf6b63f0a232af9f1899e428
font_01_sfnt_off00010cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD0 16960 bytes
SHA-256: 7741a974fefd8aef73c2e51ad99c58f55c241575cd6a371cfd42c2450251f03e
font_02_sfnt_off0001390a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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