Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ba800c73238be0…

MALICIOUS

PDF

96.0 KB Created: 2021-09-17 13:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bdd0ce30c70ed4515bb20c6feb8141b2 SHA-1: 57dcf68114045861619585a2a5690e95d98e4f6a SHA-256: 17ba800c73238be0d930819cd84b8f4b6f5f87b2cd2ab31fe84e08cebd482223
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDFs, many hosted on compromised or disposable domains, suggesting a link farm designed to distribute further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://iwilldoit.ru/uploads/files/files/93918343519.pdf In PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/dejozokanuna.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/wabesusaxi.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/5161162404.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/14779200779.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/87352711717.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/dogetinomudezifugejoj.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/60750749251.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f31b052e5a---tuwupomafuke.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/13628958905.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bopepu.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/mujilo.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/21179578031.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ced302369f---81739379509.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/61328461695.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/84823584846.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f51e36938e---vojonizowewuv.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/40598315361.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161372640d13a3---47464475309.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/kixulinakal.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/jakufup.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/kekobuwifo.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/21698132053.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140869d67c67---54650067544.pdfIn PDF document text
    • https://servicepapik.ro/files/7314597117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=animal+farm+free+pdf+downloadPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/44767021691.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001150e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150E 10460 bytes
SHA-256: 2e43f14c9a9149e5961544a1a6dee2f9b2cc793fc8d74bb91948c3469ba6bed6
font_01_sfnt_off00012cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBA 17704 bytes
SHA-256: 80d650c40b347b11f37264a3864e40930f126b01cc0f0e7490928f332c51e3e1
font_02_sfnt_off00015a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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