Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fd4062cec3697a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 05:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bce79918dae3b081092b2bcf45731d91 SHA-1: 0a9fa61ddfdb3f10d8a04b09db5d4ff5899f9167 SHA-256: d5fd4062cec3697a75890c30f23574c72273dafec59b5e8af69a13a0b4372683
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://drafthe.ru/uplcv?utm_term=remote+desktop+chrome+android PDF link annotation
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139a373c77b7---45393611867.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/wijawozoxukiforaxefa.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446788419ce---lavidivevuximelig.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/gugasojapepow.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/82698642077.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/3481221207.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/61551174980.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/linawotinevosafofitaxurik.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/wisarakamoloduxipozed.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/raguritizavez.pdfIn PDF document text
    • https://botroul.be/uploads/36875477961.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/fumasupowiwuw.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/pulinodonexajidatufoxaz.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/mosenino.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/70033179093.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/16321733489.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/96806294233.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/bujuzosodokutu.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/55312437859.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210916025907.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/80226190763.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/sejamolopifakugigovi.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613721707196b---wujixexewagaxovusezusamom.pdfIn PDF document text
    • https://mimpidia.com/contents/files/60465193056.pdfIn PDF document text
    • http://lactopad.com/uploads/files/56104783063.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/20777135200.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/13527392086.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_off0000e077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE077 17560 bytes
SHA-256: b9498dd5654f023601a21ec1295bed943b1d985c538b15571de41227c3921f40
font_01_sfnt_off00010dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC3 10868 bytes
SHA-256: 52b904b21617497bd2c1088705e0f88dadc1634c916963718ce2bf92f81cfacc
font_02_sfnt_off000126b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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