Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6e9b115c1b14a4…

MALICIOUS

PDF

82.5 KB Created: 2021-09-14 01:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f0ad79e308184e20ca37f64bbb00a95d SHA-1: 49aebe59276b3d2968d638aadf98a2aba43b4e18 SHA-256: de6e9b115c1b14a43c7ae23862ebbf1f5b0f20616526cf930e6e93a2150581a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to direct users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://manhchenang.vn/webroot/img/files/ziwimadotevefijopa.pdf In PDF document text
    • http://francescasciortino.it/userfiles/files/19231500966.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/77103891433.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/57649951821.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/rureb.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/36277055592.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210905_025004.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/73187339996.pdfIn PDF document text
    • http://jucal.es/images/file/39391368902.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/24321297070.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130847abb17f---kerezenosisavovezu.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/fares.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a083f32c8---70648134507.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/tumodotenoto.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/84659494286.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/31313498962.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/tokuzuvezugogidelopotitab.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/lorofuz.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613472a2227dc---96574405156.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/27236807274.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/42718410830.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/32119064978.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/44459336469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+long+does+cooked+chicken+last+in+a+fridgePDF 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_off0000ddda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EC 17360 bytes
SHA-256: dbf6d111124ec70c0d1c6ebc3d61063155b4ab7c003e686996d6d027b702418e
font_02_sfnt_off000122d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D7 10924 bytes
SHA-256: 34e7124e48a653a5895483c7201bece8352c28e7e157b39f558c5e9b067cfa25

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