Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b5be3c620d3841…

MALICIOUS

PDF

80.0 KB Created: 2021-09-21 02:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ed7a149f11d11bf39c9dfd21f7242170 SHA-1: b0d905b54a814aaf2c2f795e53250d67100e9320 SHA-256: 51b5be3c620d3841c084aa6d92916b4e5e96a32ee5dee1f11ea8c9f21fff414e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cructi.ru/uplcv?utm_term=dialog+mytv+apk+download PDF link annotation
    • http://influences-vegetales.eu/assets/Image/files/18232135743.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/97297933931.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/dowakuvonazatoxure.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c883ac747eb46678d81a11f0f06959dd/1042770209.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/55996092062.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/64366023793.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/giwizijume.pdfIn PDF document text
    • http://wamer.org/userfiles/file/kebozi.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/44772625bc89d065efc7a172804335bf/dorijafanomu.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/zikilexenon.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/f65d4891d866d5554484d513f7524bfd/ginudusa.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/pejuxosirob.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/dizusosija.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/19912357462.pdfIn PDF document text
    • https://kaimano.it/file/60614851058.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/sudikodugeduvinatomuzepez.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/4cb81997ce359b2c8811856e50f4c83c/29224669837.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/34074217292.pdfIn PDF document text
    • http://ktcz.eu/files/files/kasejone.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/77301539452.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16148cb0b77e75---wusojedirawa.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/69409933131.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/rukivasikatipufuwefit.pdfIn PDF document text
    • http://ippon.lv/uploads/File/bijuxawesalexov.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_off0000d3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 18060 bytes
SHA-256: 94f31147490e4fe89946ea8d7108fa722a42fb93fc52715ab0c0ae9fbae336ec
font_02_sfnt_off00011a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9C 10692 bytes
SHA-256: 27f254417a112f4f20aca186b65b6364c151ea511b7bd6ca4c9849479a423b72

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