Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6072d4fff407d4…

MALICIOUS

PDF

86.5 KB Created: 2021-08-02 09:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d5ee0a7a6b8e6c27fe08a77fff9e33de SHA-1: 313ecec66ed09dfa732dbd2afe4379b0c658e71e SHA-256: bd6072d4fff407d4aabdf872491744a11382e6ceeed63785e6bc8c7a616f47f5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites that appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. No scripts were extracted, so the primary attack vector appears to be the link farm itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gretajensen.com/ckfinder/userfiles/files/nebijur.pdf In PDF document text
    • http://bwlpsalisbury.com/uploads/files/93210537029.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/7caff5914332e692fb180e449aa97876/tukafopevarumazenowowama.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/45909094796.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/clr6kbe8scjd8r7176eo2re8a7/bapuvamekesawejifede.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/29760589dabbfcfd82e3a6a8bdf37398/36879657732.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a17b096d827---85895439873.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d449945a73e---nodefafegosol.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6790a0b1f---nusixi.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/muwesazugo.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/kowugosebajesogibubuv.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/96796149120.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/vafuro.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/23429586178.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/18516331829.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c6d9847027d10cf5af88b95d04521287/jikarorawufuret.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/15210656919.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/wunozuzotikebenik.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/70679765313.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/58ser6smgc31fbvh62bissbu45/46728023602.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d631676febf665c3d48481625dcd5c41/74002138516.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/37be1e383408579a88053b9e0910e20d/20036124307.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/rapugap.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/dowipadoxuka.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2487fae683---10308678323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=esl+simple+present+reading+comprehension+textbookPDF 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_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 11276 bytes
SHA-256: 48af216f5b9f688ebfc06fea5620393f7a434bdb96d8134820e0e184c8345188
font_01_sfnt_off00010793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10793 16432 bytes
SHA-256: 28596727101b8bd605d1f3cecf84ef0614c341175f655d8faa21d961db1922a2
font_02_sfnt_off0001322d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1