Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcae6b09cd44a811…

MALICIOUS

PDF

101.4 KB Created: 2021-09-21 03:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5fc016d5f4d3ce438d05cd60c459568e SHA-1: 82bc8471e3ecdd81083d0e211c9871b6ae1fcbb0 SHA-256: dcae6b09cd44a811e9dd0fbefeb0909b33454639434f58936ce2db5d0975f12a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to compromised websites and a visual download button, suggesting a phishing or malware distribution lure. The presence of external URIs and link farms on disposable hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alasclub.gr/neuro/ckfinder/userfiles/files/fevitafiluzexomuxunanika.pdf In PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/vbugkd96amo0jia9sdceusde72/65972085364.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/24115891569.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/83192139486.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8ueurn0qj74df15pkm91pdu2s3/47157123050.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59902964629.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/biseletebugotinaxosope.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/70718609501.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f23a86924---50616617547.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/e5e978df668869ca349802a1d91f2505/99309693071.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/92891769744.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/foxijafigotiliwugipinoreg.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16145badfbad2e---xufepetajiluwazemajuwof.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/gizaxe.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/ramolazokax.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/16797251955.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/pizitudopizoje.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/fupiwegu.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/migataxasaxaz.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/basit.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/bovasibuteridamurada.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/f254f8750917f4cb7926e8c94c90b726/57181758755.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/jebogaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=after+effects+cc+2014+crackPDF 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_off0001161b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161B 25692 bytes
SHA-256: 01ef40c580440e805472473014dad89ecc844a6e38c82c1dad6a58d52f1c31db
font_01_sfnt_off000157eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157EB 10412 bytes
SHA-256: c89b4197a91bf7133f670a79027bf30ce55d91d8e72f37086ef367c0be72c792
font_02_sfnt_off00016fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1