Malicious PDF — malware analysis report

Static analysis result for SHA-256 9534fbf0191a7443…

MALICIOUS

PDF

75.8 KB Created: 2021-09-24 01:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 100fcdcec0e4da2e1b04b0066ca7d128 SHA-1: e3df0168f5a9c35719204e72d2519136282f1d0f SHA-256: 9534fbf0191a7443f81f1c5c1a9d4beedc7c7e2c7d6aa5e5aa2bfc99fb0fc619
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true destination or leverage compromised infrastructure. The primary attack pattern involves luring users to external URLs, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://drafthe.ru/uplcv?utm_term=transfer+paid+apps+from+android+to+iphone PDF link annotation
    • http://harissarantis.com/userfiles/files/36364483206.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/tizagisapewemim.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/88196799430.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/jenozurog.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/8379986212.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3679dae56---tujupakururumikurezebur.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/baxexaviborosux.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/34785469223.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/fasinemo.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614c8de7a4d6d---18926866406.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161447299d9c6b---84467718702.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/digelobivowem.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/kepubuwefor.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed105da3e3---30002838512.pdfIn PDF document text
    • http://esistore.be/userfiles/file/dapaniropiw.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/vogozofemadis.pdfIn PDF document text
    • https://ivanamihic.com/files/losopabijopabumetedokamok.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/mezunem.pdfIn PDF document text
    • http://pileki.com/imgup/file/tagapi.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/60669180219.pdfIn PDF document text
    • http://donghotam.com/luutru/files/45598021110.pdfIn PDF document text
    • http://pi-consulting.ch/download/8085681962.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/renigi.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/devomuxuluwoxo.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_off0000c57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8C 17032 bytes
SHA-256: 061878bf800da38ebc35ce32fccbf0e1331319a6e9414520c68885f3c0020224
font_02_sfnt_off00010975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10975 10680 bytes
SHA-256: 712ff54c5f38ae2448a88134ebd6c5a8d28a3330066e497a8889dae0b56dda6e

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