Malicious PDF — malware analysis report

Static analysis result for SHA-256 41052bef8de6bc24…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 14:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 495fda19973bbbfce3b434978dd654bd SHA-1: 2ffb1003e93b8dd5665c7a17915cf451161cf66b SHA-256: 41052bef8de6bc24d21e1185834758f16d7434ec606cb865b50593c055e4cbd5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains numerous links pointing to external websites, many of which appear to be compromised or disposable hosting. The heuristic firings indicate a link farm designed to redirect users, a common tactic for phishing or malware delivery. ClamAV detection and ML classification confirm its malicious nature, likely serving as a lure to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crysiq.ru/uplcv?utm_term=how+to+view+deleted+apps+on+android PDF link annotation
    • http://mayepnuocmia.vn/data/ckfinder/files/62689273942.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/55712374718.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/filagifikabug.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/86917409814.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/zadoku.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109132100477869.pdfIn PDF document text
    • https://htchninc.com/d/files/92165295512.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/16412290972.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/zikudazizuzilulejav.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/16479102874.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/lexafadoweto.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/laredibejobasutazobeman.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161393fb53848e---larixutojuberaxolipupe.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/jodudawer.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/70184698184.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614275e1d4341---74528526393.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/lurukirufemegafikifodobuv.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec6c3c980---digebegibaxojujipozudexer.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/9936814253.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/71176059433.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321b4a6ae96---7430718993.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/22021843477.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60633534367.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/81881071930.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/fukolesugegotetokixo.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_off0000e504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE504 17436 bytes
SHA-256: 7de6784893a0269fd815e78fcbe42908a5db9edfbd6601d6567382acc4a12d10
font_01_sfnt_off000111ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EC 10528 bytes
SHA-256: f71390133d40873f1896967e9a14bc905c45ee8fb737b61ed9010b4223e483f5
font_02_sfnt_off00012a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.