Malicious PDF — malware analysis report

Static analysis result for SHA-256 748d518e12dd25b3…

MALICIOUS

PDF

79.9 KB Created: 2021-09-02 04:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5ecff318ab6bc9fd2a43576ca2e63b6e SHA-1: 6bcfc2fad369ee942abcffb1e878940275b5b4dc SHA-256: 748d518e12dd25b373afff1261ea307cab181f7bcf4f89dd272b17ed13f36148
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 point to compromised WordPress upload directories. This suggests the document is designed to act as a lure, potentially redirecting users to malicious sites or initiating further downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://francescasciortino.it/userfiles/files/jotogifu.pdf In PDF document text
    • https://retake.dk/ckfinder/userfiles/files/mudipolatuvulujonu.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/20506572547.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/wukirenurimo.pdfIn PDF document text
    • http://euro-ex.com/28653713007.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161108d22410ad---72179520563.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/33004826579ab39d9439894be3385519/88305010149.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/bogeruruxajemuratume.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b39a18623---90469913247.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/4k5sh3a00mkrcahtlf499c11i2/72005864287.pdfIn PDF document text
    • http://fruitsad.pl/images/file/44400761176.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/bh74qad3n6po2np67sl5sfbk00/dawubixigevedewuruvidi.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076c98f3791a---jamopajis.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/zakesiruwolewitala.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/c304345e6c554e6968f6048f1e2fd8c8/rinosudof.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/lerogi.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/575c4811e567efc6d25e2e8576675b91/99681303193.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/69121447669.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/649a738066bab26ba1a0ebb5cb3d2477/gonapax.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721d7901dd1---nutezemi.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1cc140834---jamogoragewikalexasarutos.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/48575907338.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/mujetikamazegev.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/29725306831.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/15338872206.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/lawikewedodawemalome.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/ocs00n9fvutejl52l2tr2oqd2v/pufupa.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/55457686107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=significant+figures+scientific+notationPDF 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_off0000d150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD150 17876 bytes
SHA-256: cc4f8811a3c0ac572ff90620be6208130d740aeffb13ba41af78e5bb19e4942d
font_01_sfnt_off0000ffc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC7 10640 bytes
SHA-256: 234942c1faec1eab3fcce003b0096d7a72678903ea0f2f6ee56aefb566c86e69
font_02_sfnt_off0001184f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1