Malicious PDF — malware analysis report

Static analysis result for SHA-256 94103aaf0430e5d7…

MALICIOUS

PDF

78.6 KB Created: 2021-10-29 01:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-12
MD5: 66509f7b100e61d8b4527c363f7925c4 SHA-1: ade3bb4804d4354c3e7b1ec4f3f1e38d88a75e3d SHA-256: 94103aaf0430e5d7fe918d2a24bae328c75522c511e360b6608b7f90856dc710
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains multiple links to other PDFs hosted on various websites, including one on a compromised CMS upload storage. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security checks. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://perkunasstudio.com/uploads/files/202109252055126313.pdf In PDF document text
    • http://ngor2-3.com/file_media/file_image/file/kaxodogenujodiz.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136e5fbcff04---vibetogafikiwukejadomu.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/nepivolotemuvumonote.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/575820800.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/segot.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/gokemuripile.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/novopusuned.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/raxaxawedapemabif.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/kirajulikaxitoz.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616e5e2657117---binitorupofegirurunudu.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/bobusiwas.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021100706032657.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/redixedakunubuforadub.pdfIn PDF document text
    • http://webs.eusko-ikaskuntza.org/files/galeria/files/jiwedojura.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/bexexivuzipipene.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/xamebune.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/35213347152.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c903a96a9f---3538849003.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/mopofewosojopujaminajame.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/12221246315.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/46668981168.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/62522563938.pdfIn PDF document text
    • http://isvpro.com/custom/files/giwinofumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/RhDyTiV0TgQ/uplcv?utm_term=tender+my+resignation+with+effect+fromPDF 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_off0000d026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD026 11040 bytes
SHA-256: dc84acec79b4408d35e478eea82c8abd2702437eebbc13d7831ecb77773b7678
font_01_sfnt_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A7 16788 bytes
SHA-256: db6994a7613f878571c64fac64a9a926145c7aa5ef8148cadddfe2e58a18b8c4

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