Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c13f2549337b56…

MALICIOUS

PDF

80.9 KB Created: 2021-07-23 11:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 89ec459744cba5a8f46d0a093160636b SHA-1: 73942dc2a247d47a4f7e7d9329a552ba038db76f SHA-256: b5c13f2549337b56775a89e9f709aae15a2b5b610f060ffd4b66f20d4f523142
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to external websites, including those hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a link farm within a PDF document to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://vresponse.net/userfiles/file/wetizebodagekuke.pdf In PDF document text
    • http://tort-art.ru/userfiles/file/56589975166.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/zebobubilowotiradekupiziv.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/feputidujibuvuja.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/11725035317.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/nimiveges.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/3029610765.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c439b78a659---85330245261.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/d67cc4d1a71c80ac024352e232a1d33b/29471165653.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/p1tq3dngqao8cfa0hi2703v60m/405425054.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aae21258fb2---doxomubiwakalito.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/77769903926.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/xezuwaxe.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e1c599376---73966308544.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/kivenekepujujatidoguvavev.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/0ad8cac28d76645dba82811812fb5899/79012108627.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096179a262b6---56469296079.pdfIn PDF document text
    • http://gapp.fr/medias/files/88058368713.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/dcctdq57f7g3m5s6mclujr034e/74009641042.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/4b7576d663f60240965b062f5691f487/kokifupojanetivi.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/92266248300.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d76c3726af---xajigedorezavexipinowo.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/boposuwunitinurifos.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5a6b8a0bb---dulijerafinawulekapasobe.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/97660634806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=global+martial+arts+chapter+36PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC7 11056 bytes
SHA-256: de3e4ae4483c8d4a3500dd4f204f3e927577d5d158c3f09d959a68fdaaf0fde7
font_01_sfnt_off0000e446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE446 3476 bytes
SHA-256: b3d1f2f93b3a7ddb744e4fc2eb175b8e84889d937da5d6e5d45d472605cc7bbf
font_02_sfnt_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 16228 bytes
SHA-256: 2208d35027537744de42f58b38c83895d1cd4b41c2131692ad0ced477f9b4134
font_03_sfnt_off00011c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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