Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3aeb0fa653ac04a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 12:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a3ecfd5347d2d143a367e1e85aed0c92 SHA-1: dbeddcd653ec06255c8525a59cafa2d74d5540a3 SHA-256: a3aeb0fa653ac04a5bf5e3fe73f9ef0126de1a5cf8cc4bf8a03d26cafafb1e64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://garglob.ru/uplcv?utm_term=thunder+tv+apk PDF link annotation
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tofifonejagedi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/24477387196.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/vuxenixakexu.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/jofaxomizonufiwegagam.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/5d7ec72b0c2a1a543520d3059c8fcee5/guwupu.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/84158069273.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/lijazipewifabim.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///xufejitozofevomavoxefogiz.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/ligabetawix.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ed36e9f73---62535940306.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405308da634---pugenekixalosubuj.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/fisafuxugadidebokugalije.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/40713426873.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/81888839978.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/91385122924.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/duditafesavutiredizegox.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471d14b88e4---87912303295.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-20/20210920071033924086.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/jikew.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/68752138723.pdfIn PDF document text
    • https://ever-progress.com/upload/files/wuretowifivewubo.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_off0000d6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 10284 bytes
SHA-256: 7352dbbd78ed08957935a9efa2b02b0d911ec2b30e38fb12f7afdc14926ba7d3
font_02_sfnt_off000105ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FF 18556 bytes
SHA-256: 17672592f49d9b0b3b09810cfdb90dc51f2369315737bdecbb1b1194f708a1dd