Malicious PDF — malware analysis report

Static analysis result for SHA-256 be2ddb9fc860f713…

MALICIOUS

PDF

85.3 KB Created: 2021-07-08 01:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: dfb68d88ff1a8319562f50d694b01711 SHA-1: fef3175c45e4dc9245b178caa7f28e8cfa694128 SHA-256: be2ddb9fc860f713b8d52f24eba88d1ed778dde0bf188edc4380f500cd9eb191
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a significant number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure victims. The presence of embedded JavaScript, flagged by heuristics, suggests potential for further malicious actions like redirection or exploit execution. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports the phishing and potential trojan delivery intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rux-thai.com/ckfinder/userfiles/files/furofutojinipiregig.pdf In PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fcdb4d97---32410023436.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/85559809697.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/b76c5ddb6b8229d2ef80f1f2739be9cd/xumidepeju.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/61f71b2e811a79532f087ddf54533913/bodesepagujetunepumokomen.pdfIn PDF document text
    • https://area5srl.it/file/nunuzepobowevesitig.pdfIn PDF document text
    • http://fittbike.hu/files/file/16289284333.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/7789000430.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a9e24a1c3---pekubijugokigir.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/56570625312.pdfIn PDF document text
    • http://bdn10.cz/files/file/75975635315.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/puzujonimetifanawurejes.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0563f891c6---logoxekaxozukokozuvubabug.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/kekilutipujuziralimos.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/xikofod.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/l7ancpjpppfuu8apctmdg5p30c/xawufixusofilunut.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///36178520333.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/jemujexubikakegix.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/potefuxumodi.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/p379i20r678s7atjl2a26dmul4/towafowijevegalapulonisok.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcdd8bed19---kujamalofivepof.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16082d992a2a0f---92818844738.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210608235544.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/56094514718.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/69840662808.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/firezizutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=index+of+pdf+to+wordPDF 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_off0000eacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACB 17512 bytes
SHA-256: 7d609447a304ea591b5cd27ebc3f07e3c5ee3d02f2b841305982e46bbce74b2b
font_01_sfnt_off000118e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E2 10160 bytes
SHA-256: d72bba978b19f1fa74bff0d38a2d8e7a4f822aa4bc5d4cdd12393e4b5775c438
font_02_sfnt_off00012fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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