Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63d549ef6ad6cca…

MALICIOUS

PDF

86.0 KB Created: 2021-08-17 14:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4b568d4bfc9ff9675e705116c9cea06a SHA-1: 00a1ed85e34bf5188de23e51073c7a2bd98b077a SHA-256: a63d549ef6ad6cca1f4a0fcb49fe0cb6f01ec7a67eba2816bd2253f3b245fb64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/nks49985gktnmu59mcuumqviel/45821119572.pdf In PDF document text
    • https://mokshadhamnepal.org/userfiles/files/muwoduselojosalabu.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608502bf909c7---sakilafogunupupezesinami.pdfIn PDF document text
    • http://farmina.ru/uploads/files/76009999372.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/74422426028.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/73428f6f9c6d7f419e5a22e015813f89/tepelepopowusimezu.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c85442d1188---fexire.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/kawujademikipovupavo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/kularatejibupe.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/8d1aebdea19e574d84138b2da94fa3b5/44024072714.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/gpamdpal97564katqc4avv7mo3/mabaxagetozapur.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1628601141_ce0c3601bd.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/24800197407.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083be485c27b---makivexawovakexugajaduban.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081539b09d5f---29706612639.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d16780e69---gibusefosorilim.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/vazerilirunipujajemov.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/biwadiwenusoweguxo.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/vozitofibisuborunixik.pdfIn PDF document text
    • https://ultralloy.net/upload/files/fatelosutodarorigaxejizi.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea288619fc---zinavonobupegufanareko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=age+of+empires+2+hd+lan+crackPDF 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_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 11164 bytes
SHA-256: 19af263285bd22a037e32f38fa667d58647ad77cad433abc3e20cb459156c641
font_01_sfnt_off000104a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A1 17636 bytes
SHA-256: a5f7efc4ce2d47f5756c3d882266fc9325ae7fcbf53b084fd65e1f6ebf3878da
font_02_sfnt_off00013213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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