Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e24fbd2677b9fd…

MALICIOUS

PDF

80.6 KB Created: 2021-09-03 16:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca3ae04efa54c84d13d01ef22439cd82 SHA-1: 669db2eb35e134acf203e1dd7b31dc89586c849e SHA-256: 81e24fbd2677b9fd966585bf47b9ae686fc3be12ce7a5927dd1cb9a66bb56c27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to lure victims. The presence of external URIs and the overall structure indicate an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://nomylo.ru/uplcv?utm_term=scalping+strategy+forex+pdf PDF link annotation
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f02859760e---vuwewonilo.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080cb5b41af3---zefatekopezotaxod.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/91uj3e9omtettltsne6r64o446/minewodenide.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/b89df60a987b0977b3c3a269bc7eec1c/mirizesivimikefemam.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/97253449684.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/bewexotebem.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/62391215124.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/zugata.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/kodotedesoj.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160971b9501bce---8124148370.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/28375333648.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16092b66970890---38420082538.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/26186798960.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/waxil.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608399ab488eb---82992102520.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/rapide.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/68410960849.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6da3ae3934---44238012631.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/lubibufulekilemozududenuf.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e922ec4631b---38309704981.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/7da775689c93b676c0659343280d3aa0/jerixemebomipupezilefoxok.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/nukagizexatako.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d5d270fcc---buxujer.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/86891497741.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/f303bd72b74d78995763d2872c948996/61574001372.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/75523c274954c0809b0272f758ab8027/fuziguzovedukisoneg.pdfIn PDF document text
    • http://chira-med.pl/pliki/88659267786.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_off0000d535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD535 11084 bytes
SHA-256: e16b515be2ee19bdf275c9bd769a9ce4bc49d44e0acbf4d7078fccfb8b29b69d
font_01_sfnt_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 17488 bytes
SHA-256: e2fe9794976172bb66fe7d015e45379a2664c6739019c8110decc3791dde2aab
font_02_sfnt_off00011c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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