Malicious PDF — malware analysis report

Static analysis result for SHA-256 27eaa485fd6d7fcc…

MALICIOUS

PDF

106.6 KB Created: 2021-09-02 08:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 56f96d5bdc0784bfce1d6e17c238156a SHA-1: 629f7f55465088e4ad6c5e6f75c5ce1ea4fc1447 SHA-256: 27eaa485fd6d7fcc1d3b3eb8f1f6caf5a87c6a1807ca6be5aa0184456f1407b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=list+and+explain+barriers+to+effective+communication PDF link annotation
    • http://cephedanismani.com/images/pages/file/60647231076.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e8b9df76---22645915509.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/rusubuwisulibavulopi.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/25231740155.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/75854083548.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/3644958284.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/60368587115.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161100aed6348a---sufafed.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/nosifit.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/13901201863.pdfIn PDF document text
    • http://iphysiology.ru/upload/daxiwulerimefovekikat.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/mupetonadelixaxa.pdfIn PDF document text
    • http://chemsdano.com/upload/files/vijuwizifubimin.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210709_A651AFFC581550BE.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/savefovalev.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/gidoguzuginukewomilon.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609ceed0ac891---nizuf.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/2578175147.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/37030300672.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ob0smqba6o0ntp6v20kmr8ag2q/pazefusakimimuguzositesi.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/xezovudatapowowafidowavi.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612351d0b0a2d---95391259638.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_off00013aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000152b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B9 18744 bytes
SHA-256: fedc5a3d331d0823d8ab518709b423138723b2efb3e83af8e3f0d7ad067d21b0
font_02_sfnt_off000182d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182D2 11144 bytes
SHA-256: 38b534594aedea5267b860e517efd93436ead4673e5f2a73af02801bafb79798