Malicious PDF — malware analysis report

Static analysis result for SHA-256 39428d34a26fca84…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 12:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5d7315a25f37429f23e2562eec8f80cc SHA-1: 8085adafa2146c9d5efd07453a0f2c4a8d0dcbab SHA-256: 39428d34a26fca84e4f29b613054d74c20a7bbf6c23ca8d8c47ac8f0615291a7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://arcos-eff.it/userfiles/files/98364372896.pdf In PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f399261599---72479540328.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/gd6jab1vaq5m0ule7mi2lshk53/gafizotamimiwi.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d151ade79a---24813492414.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/rowunuzebowilinuvurumeji.pdfIn PDF document text
    • http://pronobile.com/catalog/file/98198230113.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/94950792451.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/zepenonogimazabazuxo.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/ramowujogibudefijinusi.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/27944713666.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/duxefilawebesepoxas.pdfIn PDF document text
    • http://sjhtractor.com/d/files/dokizupuvurazufatosab.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/nerubewuxa.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/kufax.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/rigowox.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/luxigisaxamegajazorita.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/314fcd9d12aa3220a9e33668eb3f137f/wamife.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a7d14b2d300a01116507a069f616eb89/nujulituzexozifemirefanuv.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/44074537054.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/43852721898.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/67295055527.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/97469757109.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/nirevezigoxisurisodof.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210909181151.pdfIn PDF document text
    • http://epplast.com/files/file/42300284320.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/bijufif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=i+beg+your+pardon+meaning+in+teluguPDF 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_off0000d2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AA 10872 bytes
SHA-256: bc708f94660badb9ec1f960b297ce123613bcb3d9b6d64f2b397cae51cdc7615
font_01_sfnt_off0000eb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 21876 bytes
SHA-256: a35847a5ccfe3f6466083c3684193c2c6afd085c9a45452c8ca72246185b9fce
font_02_sfnt_off000122ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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