Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa02dde75acf80be…

MALICIOUS

PDF

79.3 KB Created: 2021-09-08 19:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d4ae72bca1e1c7c475f3375f97e7184e SHA-1: b083f909e9637ffcdc998cb3af52e4ff734061d4 SHA-256: aa02dde75acf80be8044345959e462944bca49c1a8dc1b92fe2d6e71e1f268b6
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 WordPress uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/mndjqjeibh90h5ar390d8uk5v5/danodafalupopuvusijib.pdf In PDF document text
    • https://rieker-consulting.eu/files/file/73389721129.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a90c5d142---36953871567.pdfIn PDF document text
    • http://yljczl.com/uploadfile/20210907073107767.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/sawegonaxedaxizolefojova.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/xutajuba.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/sixoborijotetasiji.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/domakonem.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109071524119647.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/natoniduxu.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/50477833095.pdfIn PDF document text
    • http://palami.by/images/file/vosobalamedurut.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613064f89e719---38492693259.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/22735847202.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/36395591714.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/56884390642.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373e7a66366---20671651832.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/94847871371.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/94732916872.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/11288877152.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/tinorozibad.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/61066075793.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/gidikobipenerorufiko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=dads+worksheets+addition+word+problemsPDF 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_off0000d289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD289 10976 bytes
SHA-256: 3595bf64db5a6f8d71d5cbe09b7ffaa124fc0edd23d5c8b57d2852902ea3210b
font_01_sfnt_off0000eb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A8 16960 bytes
SHA-256: ad132d21836ca47d30040dc1e3565d1936f54a61c974ca75d89c5bde94b493df