Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b083bf6096ce6b…

MALICIOUS

PDF

87.6 KB Created: 2021-06-29 22:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ae925a54240407e74cc260be4334d62f SHA-1: 77e57cdcb3ae5361c9db7ebd7623f23801609f8a SHA-256: f5b083bf6096ce6b98972b86bebdfdcf186fdacccefd1f1c51d1c68a8902675e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wastran.ru/uplcv?utm_term=femoral+stress+fracture PDF link annotation
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/3886cbec40852f84107c43cf91081976/kaxumovenumofasusotekux.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/476e37d72119a0d39fd52ba484fbadb5/26656717660.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607534a2854ec---36708716197.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/difafezet.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/v4n1rtbivd34t2qbkdbjq6mar2/32933065020.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/35965158579.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/34151640926.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/nabemativagimexedarem.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d1172d93---kotiguwebelavufaxurige.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/4372323b24bd9aff4be35808dfc1fc5b/fewakovemapodemuluvot.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/3275584079.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070706bd9d93---15407328482.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160741ba6b60f9---wewox.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f9d1a77a8---50198602166.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/63j491s8qhoskqaq08pri0s4p3/nepagixujawek.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/75964060324.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/1a5mu8n0vavbbn1rteh75ekpnc/95316888208.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e479b352c9---misadoxatewan.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/91030778117.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/9c9a6570dd3dcfb09bab4867dee51aa4/9525994562.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/buvilisoxu.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4f4cce9150e3d3f013608234b5bf5a90/33131467703.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/adc1b7b7b5bfd4caa880d12c55093143/towiguwajatefejujojafe.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/6feb6c6b120cfddceb594d36adade74e/53217131211.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/jifirukavo.pdfIn PDF document text
    • 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_off0000f4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F4 10380 bytes
SHA-256: c35bc08420d7a6648f21b7fe247eb9fd31be4b66b74e3aaa62ad8f34bfc039bd
font_01_sfnt_off00010c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C81 17096 bytes
SHA-256: 3fd905f96f2730c7d7964841fc0891fa5df80a830e55528b0e5b42ce495e1b15
font_02_sfnt_off000138e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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