Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3413e97cf78df5…

MALICIOUS

PDF

69.4 KB Created: 2021-09-18 12:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7204db40d5b3cc6ab933d9338f69f28c SHA-1: 4f9a165d988ed36c1d1a531fd700108443462c42 SHA-256: 9e3413e97cf78df52d1ae0f41c5e2b3de9e67114cd414a8e6093c53626dbf0d6
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, many of which host other PDF files. This suggests a phishing or malware distribution campaign where users are lured to click on links that lead to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://carrasvilla.es/uploads/files/wifenobumajufi.pdf In PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/28096604244.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/pizefajobulakasofumewivi.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/46nlvg6amo7pkfbmps58c6lji4/61426212644.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/61066723571.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/lalifobuzunewifuwomijizeb.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614020c6ce507---padok.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/raravevaxunumesuladap.pdfIn PDF document text
    • https://fultoys.com/userfiles/11467224034.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/cmj0m845faraqut216e5uubc50/bobolovezij.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcd655fc24---39090013013.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/tejasugivusapamitagafujo.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/13850713223.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/63921510463.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/xoburelegiri.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/zugaxidajelatifasafole.pdfIn PDF document text
    • http://rubensova16.cz/files/file/kukewalusiteku.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/lusemunefopowaxa.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae5fdf3c7a---9673481481.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/78113440701.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e17cd2e2c7---veguvatinijadaxevejuri.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/sofusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=calculator+history+androidPDF 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_off0000b1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B7 15068 bytes
SHA-256: e6ada6c252d99b9a4cf4c15748e22bd8e5ddb8e783fbe7c8d48fd40819035704
font_01_sfnt_off0000d7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C7 10580 bytes
SHA-256: 12c4acff54fd92c26694502abbd8c5dab8b33547d358028b8bef977559c237f5
font_02_sfnt_off0000efea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1