Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b674abb0ddb0599…

MALICIOUS

PDF

74.7 KB Created: 2021-09-21 04:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b2d0dc257446d91856bc57e370626a3d SHA-1: cbaad7d5e2be504bd9901bddc59deb861b73b985 SHA-256: 9b674abb0ddb05995681aa30dce71c2a3771187912671f38011a1b7db325947d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to various websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous external URIs and the 'link farm' heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/g36r4st7bo3qcq0ptqeuhadqd4/43985167991.pdf In PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/1036940124613968fba7796.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/sowalegiziraserim.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/zotov.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/63249338886.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/94516646576.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/sumizuge.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/lafutasewadoramu.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/deaed321a6b8da6bb293f816d51820c6/ledegufawimom.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/31456149473.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/41838953601.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/xuroxipeledugi.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/87625225806.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/jaziromaxukis.pdfIn PDF document text
    • https://network-italia.com/file/79440985450.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/22771161492.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/kabuk.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/lojijitikubalonej.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/nilokukuwunajej.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/95044369855.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/siwedimi.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/fifuzoxuwakadisukiwa.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8a531a92670139c7c458be8f3e063ae2/63245776273.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/87562804932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ip+address+changer+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_off0000c47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC91 10480 bytes
SHA-256: b81f5c37f74b1e858bc06c2acd234ed15f3d8c1cb11f7c6437e05da7d3882467
font_02_sfnt_off0000f412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF412 16164 bytes
SHA-256: 9f1b9d6632cdcecf1a8180d795fb04f961b8e2699cffe50bac991dfdf41a350f