Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9ef5016abd5276…

MALICIOUS

PDF

110.1 KB Created: 2021-06-11 13:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 269ffa717975ffb5b7c85f0a48a7523e SHA-1: edda78652b77382c8a475d90cd54b034d8f052b3 SHA-256: de9ef5016abd5276450e8437e857ae8358b04fe5bb50b6eabc544967bcec08b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medvor.ru/uplcv?utm_term=my+hero+academia+movie+full+movie PDF link annotation
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607baf2720bfc---87307910821.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f6741916f---78206407180.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/newedanufexe.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/friuuavtbcjqtpgcn4jpunilon/talugudo.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/pevudox.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa13550a1c8---68699760110.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/mguc1sc6eo6bnv0u3mnslj7r34/fefekobutuzipam.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/64698091557.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/pezakatokiwajelewar.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/m3enn5obsbuigjv4ug1tqd2217/60617917734.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/sulodumetekemi.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/f39022503cb05c2d20f8f9618e075015/54226775656.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/mqa4sparc124so785kjptkq2e6/mafojojexidepimadoze.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/lpgku5oemdsfustsvuc34p44u5/pujosiwetum.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074acebc9fa1---pobutujanapukepetetaforaj.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/81444916035.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/6342400771.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10893 20040 bytes
SHA-256: 63e28bd280d4bc91bb72a01d7f22b87c92a9ed71fc1e99212010d7d9df280435
font_01_sfnt_off00014950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14950 5252 bytes
SHA-256: cfe2f029fd79ead982ef68edceebc06ca2a66c58fb1d329ec8168f6c65f654d6
font_02_sfnt_off00015b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B12 3688 bytes
SHA-256: fe67fc17dd2368007dca1f56e8f9155fbd4a66e19c342a075c5e5fca6e1be7df
font_03_sfnt_off000169d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169D1 12308 bytes
SHA-256: de60b6ba8a1eebfe3ac82808d4532fbc3ca47f2060f90740904782167def77d6
font_04_sfnt_off000192e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192E3 16232 bytes
SHA-256: 8c4f20850708d391b115a482448c651f2a982fbdf20ce527d670e7cbafe14b49

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