Malicious PDF — malware analysis report

Static analysis result for SHA-256 def0bfa43e19d21b…

MALICIOUS

PDF

76.8 KB Created: 2021-07-31 19:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 97634a6d842541595dcc60316a54de07 SHA-1: 3cefc113b5e12dcdf4dbb79f07c08019e8e35452 SHA-256: def0bfa43e19d21b9da8dad12dd7c236a96d094455b7763a245ccff254b59d48
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to host malicious content or phishing pages. ClamAV and ML classifiers strongly indicate maliciousness, specifically a phishing trojan. The presence of multiple external URIs and link farm heuristics supports the conclusion that this document is intended to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/9d0f6c77157e4875c33565bff99692b7/11586185841.pdf In PDF document text
    • http://bioscipublisher.com/files/upfiles/file/novasusedegitarigi.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91410499731.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/tegolinenavimujadiwonus.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c98274c6689---fadojiwoba.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/lejemujobenusigeguxopuzuz.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/8536c3fbf3d11416d0357b023fda3e66/89339526671.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/695d654469523a200e28657001736220/23671112776.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2197a4e85---92843549692.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/b0h2ndlc1h8062dru88m0dikfj/surakunononiv.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/753b4d0680f34899f35e809877fdf336/66616072898.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/metapekas.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/luwakej.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c06773656e1---datuzalivininuvi.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/1902985518.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/87919864793.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160926ed5212f2---44256856936.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160831cbb9c468---15880923406.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/sasolowupenew.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/xusupeb.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/j1qlvgs8jt6r3s0bs9tn0bs8r4/45182710939.pdfIn PDF document text
    • https://yalcinplayer.com/calisma2/files/uploads/54152674204.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f357896ff148c4edf22c04aa2a52c82/82637786713.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8396bc4da---65756326722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+call+freddy+freakerPDF 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_off0000c8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CA 17356 bytes
SHA-256: 183f96990ca8ebdc3c4b02f23871bd63188a5c2666dafe70b9b06c7285a8a865
font_01_sfnt_off0000f67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E92 10388 bytes
SHA-256: 958c55f0076cf220f02458c3391dec34c68ed409ef838e179ae26fe980e727fb