Malicious PDF — malware analysis report

Static analysis result for SHA-256 4888838d0b685091…

MALICIOUS

PDF

86.6 KB Created: 2021-09-16 17:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b704cd559485f7193ecefecfa64d7d95 SHA-1: 8b52cec5964dcb94fc6ab1da9f4b17c042bebe9a SHA-256: 4888838d0b685091967382c2ba51d85826aa359eda560735217a58bbbb901946
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://wroclawmodelshow.pl/ckfinder/userfiles/files/2506417006.pdf In PDF document text
    • http://pkynfe.net/userfiles/file/48342580512.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/26535989577.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/18806635018.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/joxagopasimafovuzitula.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/bediwafejejaxotejagugi.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/87588979077.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ae21a06f8---kokubikabudo.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/49191001044.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/wetuwesabitenapulo.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/34273521331.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/38202555791.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff487c2538---40334981400.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/48443491392.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c5c7a5cd08678323a85b5f6842528a86/6589902847.pdfIn PDF document text
    • https://luminex.pl/upload/file/lebasu.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/weralebujajozinilokiged.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/xarevesikututobejaxozo.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/55260011300.pdfIn PDF document text
    • https://dellrein.ru/content/file/difulot.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/98183003999.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/25123419183.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-05/images/files/49657151868.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/87896506159.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/bovamavitebosasoditi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=smurf+epic+run+apkPDF 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_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 10476 bytes
SHA-256: 20ca2d5156818bdf11099bbb37a6329eb26817d3b2a7933868622634ab9e5a8b
font_01_sfnt_off0000ffba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CC 20052 bytes
SHA-256: 46783c2275bd49914f3d8d316dd3ca2caa099d78592555d4aaeab6ce2b799df1

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