Malicious PDF — malware analysis report

Static analysis result for SHA-256 34dff18b8a75ba99…

MALICIOUS

PDF

69.1 KB Created: 2021-09-30 23:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 83d0b6296cac6d01a68d1c09733f113a SHA-1: f358051c85bc4fb5b86df544ea466362632c08e3 SHA-256: 34dff18b8a75ba99b67092ee34fcc40cc96bf1f58d4854b740865c2db28fafd3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm and potentially malicious content, with a high ML score and ClamAV detection. The numerous extracted URLs, many hosted on compromised or disposable domains, suggest an attempt to direct users to external malicious sites. The document body is heavily obfuscated and unreadable, indicating a deliberate attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=andromeda+multiplayer+classes PDF link annotation
    • http://apexnepaltravel.com/userfiles/file/damepomi.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/balelewavekitoxokigozibaz.pdfIn PDF document text
    • https://dm288.rs/slicice/file/42665439602.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/1495935021.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/8479646391.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/11062431369.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/mabeketif.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/wukevemaref.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/zemijigifug.pdfIn PDF document text
    • http://eko-uklid.com/files/file/51709565331.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/dikudisobitizarorafotenol.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/f0c6bfd059be9ba5eb1a4c9545d00574/68220926999.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/23775855583.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1f3784010---78857758849.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/fuxewakutilaze.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1j6kbasrcqtdg1mlpid0ivmnv1/numif.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/retepi.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210929_90609AF6F88970EF.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143216527a80---24425239273.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jalidepigidigexulevoreraf.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/fa239613ff44e49bfe4bbf229c9f5cc6/xiwanek.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/fegubuxumoduxikonuwariti.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/bukarozijigo.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/devirusajelitamidebi.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_off0000afe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE3 15124 bytes
SHA-256: a2280ac29e38e2053fd2f01d496159172f1fe21dd180755cf7ab96a418706d5e
font_01_sfnt_off0000d5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BC 10872 bytes
SHA-256: b30784fd86ba88a807028d26809c79761456d0ab14000618ddffb75f6a5905d4
font_02_sfnt_off0000eedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1