Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52adde24a23c9af…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 17:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d5ce890e7039f4512563260a65d5a30f SHA-1: 794e0fbbf49832ccf6625b5fb27aea8cc2dd66b0 SHA-256: d52adde24a23c9afa939649a0e62381c6386183d8762d0ce2f8b948f227c3b59
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, a common technique for distributing malicious content or phishing lures. Heuristics indicate these links point to compromised CMS uploads and disposable hosting, suggesting a deliberate effort to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=social+studies+book+for+class+5+pdf PDF link annotation
    • https://hyosungulf.com/uploads/file/muratamelipowi.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/vutadaxa.pdfIn PDF document text
    • http://rts-3.ru/upload/files/zolisovewuwi.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/98481431104.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/63856894191.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/tiferotigi.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/suliluwemavigamapu.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/jigiwago.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/rusug.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/voxakuti.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/45cd050ac6da65ffcb733ad5da1d36da/64078009394.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125c7e3e7bf0---xufefepa.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/jelezixizuwaxibu.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/wivuw.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/galodu.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/sadoxufimu.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/gopijidaxamanupirugaxu.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/pumari.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608799ec1c1bf---67309995146.pdfIn PDF document text
    • http://eurekaloggers1970.com/clients/a/a4/a4917853023b9a70bc4506ca58f09c65/File/14132470124.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/gibef.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/adfa2b4973c659f4c33283a5dd07040b/tasitimenenoxulux.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/xakomatulituvufugezisomef.pdfIn PDF document text
    • https://felicityokolo.com/file/vuwajunitokexof.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/faligufananeruboji.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/b1f1nrbignak3a60amoneat4f7/28626539426.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 11048 bytes
SHA-256: 928db086f88deefa5e246eaa3123e3f3cc6129be35a893dac363830ce7bf1f5f
font_02_sfnt_off00010f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7F 17580 bytes
SHA-256: 51166eb424afc6a9bc67cca7e0012450d3715e54a1844da3af497bee9993256b

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