Malicious PDF — malware analysis report

Static analysis result for SHA-256 33fb01bde800cb55…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 23:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bd0d12b8352f7dd1c137acab49410892 SHA-1: 0e0cda36c44976ea46514d72f2b7bd6b59bb9b77 SHA-256: 33fb01bde800cb557a78c809ef6f7deed202c17ed51ea55fee585e5964c41880
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, many hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/195efbff19374bbed5befe7e2b4c5c01/lesogupiwekonowanil.pdf In PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/17a17c4e50a761e5e6dc846a4dd77931/23956039777.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/movibeki.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091eef8baeda---23958021146.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/luvokunexozew.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/20880493483.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/cd9b426e7383b5738bda2a1dec85f502/4578173158.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/12504269212.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/nadasogazanufik.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/minoraxitedepamogopiped.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/povaxutojit.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/61206d8416b73b300046031e09c39d7d/pudoko.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/taxemiju.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f7325367d---94662994102.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/86ca1da5b10b738bace67cebc5ec616e/fokenipak.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1382da04d0---sinabudojazajuvitu.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/28758613059.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/35409186493.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/mosilupuwasow.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021814112283408.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160769f662b72a---95182813800.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/luzokowugumasetefifekat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=two+finger+mandolin+chord+chart+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_off0000dbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE9 10948 bytes
SHA-256: 9af3bdb0db615c8aa0dd3b57379b460b839bc4accee850699fe7dee617a5a10a
font_01_sfnt_off0000f4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 18984 bytes
SHA-256: c47fc9c92dce7727897fcb9a2591d9cd233f47218d9f79ba95946e40418463c4
font_02_sfnt_off00012604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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