Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13827270f535dfa…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 06:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9ba4b87b16aceafb3851e431374b6c22 SHA-1: c1e08113c63d211fb88527777dc59e1f98c57321 SHA-256: d13827270f535dfa1fddbb86e115fc96f8c1a586e0a850d1f888d6d02d8279ad
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ambulanceservice.pl/userfiles/file/xemexedijuwa.pdf In PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/64427882547.pdfIn PDF document text
    • http://school15-tyumen.ru/f/72627708908.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/97474293861.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/5051518065.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/tulewid.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/59140949244.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/xupunovekukuviratawawifov.pdfIn PDF document text
    • https://businesslife.com/content/file/bamefaxetav.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/katolet.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133df0a47758---nodofefur.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6542455e9c4a9e9ca39e0f27c23a840c/92785049284.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/xabojinojonegos.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/95193406599.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/67852003457.pdfIn PDF document text
    • http://savemaxint.com/files/file/71077953776.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134336668da3---55478373763.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/pemevonexowoxaxokufaruk.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/roradogegab.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/79135699185.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109191003588760.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/20190469185.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/sujogifufikunalijoga.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/35037d9d4ee15e02ccbc016898661bdd/68152146817.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/zetag.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/39429278985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=live+not+by+lies+solzhenitsynPDF 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_off0000de89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 18176 bytes
SHA-256: 5a072a892e19cb2f3b72d4f319d9462b11a00daea13e1adcdf098d10a4aba2f5
font_01_sfnt_off00010d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12526 10280 bytes
SHA-256: dccbdf1101e0b39cb64a9392d42cfc371e3fca4b8196f193cca79409ec7dd3da