Malicious PDF — malware analysis report

Static analysis result for SHA-256 a045593439543c80…

MALICIOUS

PDF

94.7 KB Created: 2021-10-13 18:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: c4e5c950da64ada240969d29777bd1fd SHA-1: cb647c48c71943d478993febaf9e8ba705fec70f SHA-256: a045593439543c804a02e61f4ec6474228cee08848105a08c4dae9d8241c012f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or link farms. Heuristics indicate a 'link farm' pattern and a high ML classifier score, strongly suggesting a malicious intent to redirect users to harmful content. The ClamAV detection further confirms its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://poolpoint.be/uploads/file/xefitomokewovazekena.pdf In PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/solitobarazexurixaluxa.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/puzivulokadelifazirizufox.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/fuvoxirukugowasax.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16164fab496029---sugide.pdfIn PDF document text
    • http://potlista.com/file/files/daniloven.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/sejowamojojabegewifizo.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/lojevirukikipu.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/ximezotuzex.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/7049944220.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/8676084662.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152442e9e797---99644468161.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/vimasisufugoxu.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613976d96a8f6---61316474757.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/3c0a8c20a25ecc9f7001ce0965f6fccd/33372883937.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/nawavifenugimujujodajax.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/64534830153.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/61511432531.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/91301027052.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/56iqi1ckfl3446q84men1c3934/tedebuderuzeronuxet.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/68758520460.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/jipulimamov.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/gamitetawusapugoxu.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/gimakikagowijegif.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/vaxepumefoneguroro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/KGDyd8lM0uI/uplcv?utm_term=how+much+does+the+lawyer+earn+per+monthPDF 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_off000106b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B0 19784 bytes
SHA-256: 676d7578d43ad383c118b9df2ccdec3d1578c6f9defc5c93e7422530fd70c06a
font_01_sfnt_off000139da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F1 10976 bytes
SHA-256: a3472f9d7d2a53c31b227b46ad61d241f58564a0f1532e23879a35e1a4ed5b79