Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6f5954dfcc6413…

MALICIOUS

PDF

80.5 KB Created: 2021-09-23 15:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba1a9d2e814a439bd4302196f098e80b SHA-1: d61164a87990d00cb7a5bfc8625d3c9064b79bd4 SHA-256: df6f5954dfcc64132c6337814a079e42ca9442ef825c2083006a5b441498d3ea
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://pixomot.ru/uplcv?utm_term=nba+2k+ios+codes PDF link annotation
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/3504772268.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/vigexezajodedoturopib.pdfIn PDF document text
    • http://toonesk.com/upload/gomumeroke.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/regiruxusewanafixox.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/jefirapojixopizozasal.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/pewodagi.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/rirakuwobifa.pdfIn PDF document text
    • http://live-net.it/file/29108082895.pdfIn PDF document text
    • http://licausi.it/userfiles/files/51514487024.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/63283459197.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/61357430087.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/jepevovejebanorufifaru.pdfIn PDF document text
    • http://humanlitech.com/files/files/7125408336.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/luboniwiweriwuxik.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/2767308899.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/jebufaba.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210906_12_43_47.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3ba0bc2c4---14375269480.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/1b6eaa3353fc4c65aabc870f4e1e9843/dupibodevugivuxinimesafe.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/33890595220.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/kaguviwewadoletekudigided.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/davavetakapimamasezijagul.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/81190541726.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/4111340237.pdfIn PDF document text
    • https://red-adlay.com/upload/files/29312203349.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/33464067111.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bffb8c2635---zalapugasapix.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/gedoxikenuwudap.pdfIn PDF document text
    • 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_off0000d4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ece1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE1 10344 bytes
SHA-256: ed88498fdc725796d23c519a71a3e2c564a5d7f6fda2ea45662881b1dc91b084
font_02_sfnt_off0001047c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047C 18104 bytes
SHA-256: 057ec5a05261289a26022883455ab072f4e200a806193fdb37b82fbd5e21fe03