Malicious PDF — malware analysis report

Static analysis result for SHA-256 11453ccfef296723…

MALICIOUS

PDF

85.9 KB Created: 2021-09-02 08:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6034702d3d2c35a2d2e51db41b9a653d SHA-1: 33caf2e2ec2bff3ce965b9b214bb08ada6b81a43 SHA-256: 11453ccfef296723329ec4f2dd847a7c0903e0bb3c93fa28b5d6d7e7786d9643
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads and disposable hosting. These links likely serve as a link farm to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://revize-elektro.info/UserFiles/File/veroxivepadijidimeri.pdf In PDF document text
    • https://louvre.lv/res/wysiwyg/file/sujumugodebawovujadutexel.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/1bc8b30874948ea711f862c862b1a7ac/54135012934.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/73305387893.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/pegunagijezepowupunorafik.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/wenezuti.pdfIn PDF document text
    • https://digireg.nu/upload/6131295553.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/38292698734.pdfIn PDF document text
    • http://domplus.su/userfiles/files/47124672478.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/265ea78edb1fdc5c2b8ed99112646382/famusuz.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/fgbgrg4cdhg8hlla4m074th0b6/kiwapepozibez.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/vigipinenamagub.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d2318894b---95380642744.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/poremo.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1954b8982a---muvulaxepilodejexuzaruda.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/r80ggl3ofcfrhj1qk81da5aru7/novatunumosudaxuvifekobi.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfefa08b4c---finovowi.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/97370950826.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/voretomi.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd4b6546f5---76382111142.pdfIn PDF document text
    • https://rajakedua.com/contents//files/pikomexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=bloons+td6+free+iosPDF 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_off0000e326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 10408 bytes
SHA-256: aa140b815ff2aa8d44845fbdc7ed622ce7f3ea613ca6045931777939332ca46e
font_01_sfnt_off0000fadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112ED 20708 bytes
SHA-256: 345b50262125e265c4a66acca80a04f82e214b71354b41e29029a06e11425c5a

Open this report in the interactive analyzer, or submit your own file for analysis.