Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be9111f3ae54565…

MALICIOUS

PDF

74.4 KB Created: 2021-09-07 22:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6857ae3f9ae763b57ab51a47076210b9 SHA-1: 6429aee2b31cf2432f15b3770ee4a123b2c20f8d SHA-256: 3be9111f3ae545659548e1843117f21b89a07260c5b924d4359de3013971a694
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous external URIs pointing to compromised websites, likely to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple links on disposable hosting and compromised CMS uploads reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=original+mahabharata+book+in+tamil+pdf PDF link annotation
    • https://majorsagilekvaros.hu/uploads/file/voboxexume.pdfIn PDF document text
    • http://geonatlife.es//ckfinder/userfiles/files/gudur.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f62ffd7f5106cac744180d97b6a69be6/29111599387.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/50332957208.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f16ed9772---85464434837.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9aa618e3cf36781cf5ee10c0c4911a9c/jetitunawigo.pdfIn PDF document text
    • http://hargrovefamilyreunions.com/clients/16272/File/78530342999.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839fc674a66---tixez.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/nuwap.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/wewopolojox.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/63796098565.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/01iflk7u9gattnnhsfq964f0a4/31564939859.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/k91m82apcpkdpgr9ocmls46rh4/wazowax.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/24303601403.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607df5d89736f---medexuvupubi.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/94632188217.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/hfhjrn7liuk3bpc3finqhhv3rf/finewiwikefidedemol.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/92314rntce5dbt92m7vv3p8vh3/gawonutu.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/7ulngbepmv5cn6oan55thsu8bk/7435658646.pdfIn PDF document text
    • https://digireg.ch/upload/52754611555.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/6l1micab3dc5is9e08i2gbkrb2/68267884426.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/eb4e6408039df936796374ce33ca753d/derizaweleva.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/kmlr9r5abdshen1et6agnpgu43/17254934421.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_off0000b948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB948 10904 bytes
SHA-256: 818ed0cc9a9d3f2ba3893169064a18d556f26196baf2ec40ff09c712f7d62ed2
font_01_sfnt_off0000d1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D2 18840 bytes
SHA-256: 84aa0a06faa6a791cd444b732a484772a6211c3cfe3d817f25e2f8111e2246d5
font_02_sfnt_off000101b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1