Malicious PDF — malware analysis report

Static analysis result for SHA-256 f421abd4e9af6c7d…

MALICIOUS

PDF

75.3 KB Created: 2021-09-24 03:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4baa20f753c87feb1281604da9a67630 SHA-1: 30c6612821dfff2bc597e821a461a17b8aea7e6d SHA-256: f421abd4e9af6c7d26e0cadf8e2f12f36a31ead71058e64ffc67b0de455fbeb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and link farms pointing to various domains, suggesting it is used to redirect users to potentially malicious content or phishing sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports its role as a lure or distribution mechanism.

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 https://oniceh.ru/uplcv?utm_term=other+data+in+android PDF link annotation
    • http://tpokebar.com/uploads/files/taxasikevepujusaz.pdfIn PDF document text
    • https://adikkedua.com/contents/files/xeximobitetoginabujijitap.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/kukugozutolajibakevet.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/72776655330.pdfIn PDF document text
    • https://cooperspick.com/files/49531752440.pdfIn PDF document text
    • https://fitvital.hu/userfiles/files/67429184070.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd1010bba2---karumugepabanas.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/d5g7ei3nf7vltkdservpu24946/kisiworefokadetapogij.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/livepobudoger.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/57456643187.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/xekejokifodaju.pdfIn PDF document text
    • https://path.mn/userfiles/files/24440020570.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f16d8f38da883a8c2c8d1cdf19409704/pikijavuletiwuvamus.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/toninobape.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142026d001bf---97518002096.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/2172196adf956f4d343f80713d8a1c9d/dunur.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/87672760787.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/76622228192.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/2461263528.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/nisexojixiteguduligutepuw.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/50201200549.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/mutunidaruzilo.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/lubigegipofugev.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354f9844150---wubapiwerokol.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/84783611544.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_off0000c4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A0 16800 bytes
SHA-256: d26682e8518fa4d1b0e978b77d68d14261516ad656606487d39271cf7f7eb46e
font_01_sfnt_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10889 10156 bytes
SHA-256: 6d86942b3032c1a94d3cd9176c7b07efb322d9d3cbe0b0e2841d0011f4ff6b5b

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