Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ee1faa92c334e8…

MALICIOUS

PDF

105.7 KB Created: 2021-09-07 03:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dd9e30c60911f2a51b70df874016adb6 SHA-1: 644fb9bcf52b60cea97392d0d059f5dd86f466c1 SHA-256: 75ee1faa92c334e8d765e809bf1dd9df66ee8b62d8a0fe3c1938dad065d65386
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Several heuristics point to the document being a link farm hosted on compromised or disposable domains, designed to redirect users to other malicious sites. The presence of embedded URLs and the nature of the heuristics suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://kmbb.at/userfiles/file/vikejimidusolorezawes.pdf In PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/xegeginusinik.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/mizelilafetefufukuv.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/13555101682.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c44137348---446004390.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd2e561508---zefivo.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/62524833225.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/wimibenotokerudoxomuwakov.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/4244360567.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/r3864a2un29jvsno5n6scne1c7/82247479853.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/3730923856.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/24105753483.pdfIn PDF document text
    • http://vitrine-prof.com/files/xemitumil.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/9cba1942d7c5cdc2349fbb78b069e7c0/rekotijiwajepozepovosoro.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/talowipovirugezij.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/68432013103.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abab1309761---tutorumebobakunigenefi.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/73459748407.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/kitetoxonigobofizefajow.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6196cb9f1---bomororebilugivo.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7dc21996c---80399328199.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/28519975053.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16099f14aa1f52---60846442107.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/6835113019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=beginners+excel+tutorial+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_off00012279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12279 18024 bytes
SHA-256: 42b00ee09b4793f63720d05a7bc975ce9c5f42a5d17b76c3f063b418ec057c7c
font_01_sfnt_off00015080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15080 18584 bytes
SHA-256: a6310bfd4d93c2eadb7ba224d4d8c3f312cfaa725bca7b1b6bf595f7ca5203b4
font_02_sfnt_off000180f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1