Malicious PDF — malware analysis report

Static analysis result for SHA-256 0153bfcc9ee592ce…

MALICIOUS

PDF

86.7 KB Created: 2021-09-22 09:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e73da449a449cc4192fcb66196fddb5e SHA-1: 0b999e5c9abdc9c9aa241b695981db33a0678258 SHA-256: 0153bfcc9ee592ce24ece3ad22d99fece186fc3af17341d94bc0fff7d60764b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites, suggesting it's used to redirect users to malicious content. The primary attack pattern involves luring users via these links, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://smidgel.ru/uplcv?utm_term=storyshift+chara+fight+simulator PDF link annotation
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b16db9e71---3215177398.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/jenigeziz.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613366cbe1f1b---zotanafumajojalizajitalil.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1630915577/file/99759164508.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/traiotu5hf4j4pr37f9h3njp7q/sonoxeluxuregew.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/b467868ac2bff43ea121e8c49621e669/sivexif.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/zumabuwaboki.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/nejumukobaleduvejitiminej.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/80423218311.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/31494154170.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/6179286534.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/75828295426.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/96175824046.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/19772730126144de01a6d8b.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/91962602987.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/70672079955.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/2297364052.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/tesipon.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/basujefupubogavumi.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/jesobutof.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/76231414763.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/lajafufukexirazez.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/42346264685.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/36379926229.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8A 10836 bytes
SHA-256: 99802242ed4c88690c74c8f1a4e562700b2c9b33e8ec285b2ec8e8a28b04c7a9
font_01_sfnt_off0000e598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE598 21800 bytes
SHA-256: 921317908a157340240443645c4a67a10d041a2d3cb25f8120209121a0941e9e
font_02_sfnt_off00011d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D88 16104 bytes
SHA-256: 4204f4a647e3e8488fc3125e36d68471fcc515b787f7ef36a685bb1e406e82a7
font_03_sfnt_off000132d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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