Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea13d0751e735614…

MALICIOUS

PDF

83.4 KB Created: 2021-09-23 12:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14d095e315763abe6a3ee235f6f0360c SHA-1: 1dcab2b6a4666d4778872f24376d26414f24b31e SHA-256: ea13d0751e735614262ec64ccaddf11d0f415324b7dd15b6d656385a85e33242
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://queure.ru/uplcv?utm_term=disable+ad+tracking+android PDF link annotation
    • http://domingo.hu/ckfinder/userfiles/files/gibunavebifilubib.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/22668776616.pdfIn PDF document text
    • https://motoralbini.it/files/file/25995822276.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/42093901524.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/xorerovo.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/5470957540.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/25184655708.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/xanovagofa.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/fedonekusotijesu.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/40444241734.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/63341520604.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/fodaxajibop.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/13087912629.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/55170374718.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/18d7mbktv5lmvr5718uooiu231/37794007424.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/74175776559.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/siwetiwazob.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/78513020669.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/84644277300.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1208322b2---zizerolopevu.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3bf6d5dd2---pisubekisexisuzox.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109171806495826.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/44838589842.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/26161262008.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/76943454547.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 10776 bytes
SHA-256: 1bc6da63bd20c1ff701a11c57b658f4fffab5a6cb1bf93ccab3781cf2aaca14c
font_01_sfnt_off0000fa12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA12 17624 bytes
SHA-256: 7a032dd8f1a1abef5c916f8a6d3fed25f8ca06e75d2f42d1b9608c093db7b903
font_02_sfnt_off0001277c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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