Malicious PDF — malware analysis report

Static analysis result for SHA-256 0329890b50b0c8e2…

MALICIOUS

PDF

72.6 KB Created: 2021-09-06 08:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 52070db1d026157a49f00cfb7e2dc20f SHA-1: 91bc5c83f6f4f80f156adce48403739537853cb8 SHA-256: 0329890b50b0c8e2ff3ce147019c0a33cd3af0bb8d481ca6891d6301600765cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various websites, many of which appear to be hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of multiple distinct URLs suggests a link farm designed for SEO poisoning or distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/mpjpqgop6nsn8g9akrcmsenjl7/98071519553.pdf In PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/girijofowaxove.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/32983810014.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/48967796952.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/83b92f9c76704ecb4627771260594b24/92166369051.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4f050ca54---kekulasojugefimerudugo.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fad5af195---defepaja.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/moruvenurigawoneji.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/hobob40bh36mjkh4bt9fhiltlb/kukegamafiwujezu.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a090f5d700---fasilefiwowelezonaxu.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/lcp99l0mc1ajo89dcvjj1igsj0/bitafemoda.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/nomutopixiwuvelowanek.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f1fd5a7f7---81672436109.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/7a38d1a59b2522be4f5921455ed32a67/84630753642.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/tarexowu.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/16120021743.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/juletasoz.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/laxis.pdfIn PDF document text
    • https://ms01bet.com/contents//files/dijebubulemegurisamogiz.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210905_92D42C24274143E5.pdfIn PDF document text
    • http://biosite.ru/images/news/file/lubujigewitodi.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c74bb727a---58194277729.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/63982167032.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/49138994335.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac2c1f098---muvokajujopusamiluruluvo.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fc33ed04ffe---71295420263.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a25cd4ce828---kukifoxogiwiniguna.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/67b65355fd5834ab776e07291e0afd3f/wadesefisasibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hipaa+training+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_off0000bdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD7 16032 bytes
SHA-256: 3cac3a838019dc502fcf8e199d0401a215e3f10a24786ad2786df3cff2e908fa
font_01_sfnt_off0000e5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FF 10200 bytes
SHA-256: 9e9e28e0c0484805d9aea38d04620f1690a3322fae6f7e229ee9df65382b8177
font_02_sfnt_off0000fca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1