Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4a97fa7cf5c171…

MALICIOUS

PDF

74.7 KB Created: 2021-09-02 17:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2e262ceb3414eade6502f54ee02012de SHA-1: 3988051750c380f566669b0f27ec3bfcb469c392 SHA-256: ab4a97fa7cf5c171a187da46d895096370ca75601b252f9a2898be952aa607e4
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers confirm its malicious nature, classifying it as a phishing trojan. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://solyaris.pro/admin/ckfinder/userfiles/files/17780591960.pdf In PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/7d7f07596768a2175b6fff346da34c61/11460464085.pdfIn PDF document text
    • http://codefon.hu/js/ckfinder/userfiles/files/pejotalujozeruj.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/xamatokoriren.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/49593600105.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/556f96329fd3235a1005eebd5c3b5f22/xababerigawaxulu.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/fizomizobexuv.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bece29cc16a---3148820954.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608334c8db6a1---dobivusuru.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/19377624659.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/5rnhsc08k3uq5kv4tpftsglvb8/xezikupabawiso.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4a1755691---pozoderafobe.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/gidonekadop.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ab2233b7e7---bewosanixinewufuxilutev.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/236234447ecaf9f923e919434039990d/gokigudogireduvus.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/096e2cd5e0dac07e46565e905be06691/xujab.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/7937929103.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/22415125137.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/74032117e336b51aec42056a3fbd4e7a/41574401805.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/41989206717.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b52980cec3---25770858596.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/22ff1bb29ba1e9e00bde6ae3bff5e51a/13354069971.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080caa57909a---14886379584.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/pidubuxomema.pdfIn PDF document text
    • https://unicornccc.com/ckfinder/userfiles/files/nemilavalozana.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d052ff2067---mevozorodazanasalaludutid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=simple+present+pdf+questionsPDF 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_off0000c515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC515 10816 bytes
SHA-256: ce561e97ba4beb98f0afce4545b209e9d0a934b3a1114e12967b0a89e162d492
font_01_sfnt_off0000ddb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB7 15536 bytes
SHA-256: e387e0508c993f84a7b5b9a6937ff7b7abbe55f4fb21a4cf6bcc3087ca0674ea
font_02_sfnt_off00010513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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