Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8fca00926202ec…

MALICIOUS

PDF

76.5 KB Created: 2021-09-13 13:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b2e717b89c7dc1a9c8f3eb9126bb18f SHA-1: 825e01876037f800d59d91ee5567920bbd19a194 SHA-256: 8a8fca00926202ec4abc8c89a2c72bd08aff60e263618708ce9dea8faa149ee9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://classicalgardenornaments.com/uplds/file/60035752343.pdf In PDF document text
    • https://4of100churchstreet.com/assets/media/files/29988566611.pdfIn PDF document text
    • https://ijpdua.com/contents/files/62694762613.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/44942510168.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/zabexukade.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/5c30284cfef31e649b6a36d1e90b62b8/zifigopagopikeruzegoresu.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/37402864898.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/gikadinirekogubero.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/502t5h0le1p6cj6gqsujroe8gp/9478990024.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/kixavo.pdfIn PDF document text
    • http://space-edge.com/upload/files/dupawusu.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/tisowewefusefu.pdfIn PDF document text
    • https://ms01bet.net/contents/files/tikudi.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/62368243789.pdfIn PDF document text
    • http://chamdure.com/DATA/files/38491379552.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/b68296f0bf43d5e1e97b5559224d6a30/70528764353.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/jutadogugav.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vovitabudikolemusebe.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16139edd73fe49---5889934046.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161326ee08bc86---rofona.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/79931692432.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/b6b26eaab08acfb0772ba666d33525ed/sofunewize.pdfIn PDF document text
    • http://rapet.hu/files/7704992075.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/43225448377.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/nalix.pdfIn PDF document text
    • http://chamdure.com/DATA/files/kuvemesan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=marvel+strike+force+hack+ios+2020PDF 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_off0000c7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE000 16684 bytes
SHA-256: be31cdfe8602a2a9f6db66ae63a1f2a8bcebc2b1a8feaf992511566bdd5eef8b
font_02_sfnt_off00010b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5A 10724 bytes
SHA-256: a310d9f07ec7264e21cca586ca109755c91e43c5d2b207991d8a10683ef5cdc3