Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d8e475f6ade6cf…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 12:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c1725b79881b02565522818ef48b49a3 SHA-1: 577ee41a0956558a199e2106a346954262b511a5 SHA-256: f5d8e475f6ade6cf28e8d70c81e03c046dad9d0cd3b969a6d010bb60e9e19340
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/a69b48ac73170a15b8014e8a17a64019/88150999672.pdf In PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/90b0e3faa882fa82da28eeda1892acc5/bapipabutulimorowusomemaj.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/89065261406.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210913221921.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23788085418.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/845ee24e7fae150cb0021365587b2ea9/nujag.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/julive.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/85c9e5a9193ccc42f39ab4673ca0ded0/faxod.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b15fec8dd0---35011247295.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/ziwowa.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/13753993598.pdfIn PDF document text
    • https://camphacement.vn/upload/files/75968248203.pdfIn PDF document text
    • https://netlandschool.cl/files/18686159269.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/vekadunalus.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021911021242125.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/sofusepelebonajenaji.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/nofakonusena.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/10884584699.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/18444593580.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/38082307914.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad73adf32e---89987712379.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/jibisiluvesixiboxesaravaf.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/bb374c668502a299bf558ba7ca84b6e7/rujaxekadiwisemixogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=fifty+shades+of+darker+yifyPDF 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_off0000d3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DA 10484 bytes
SHA-256: d528bbfdf663aeb1ffb96c37aadf389b17f447c55f9e74baf559853b1b1440ca
font_01_sfnt_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EB 18580 bytes
SHA-256: f80c6129d13d37e24d7ceb346c0f6773e180320130f50db134d6695653a55a18

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