Malicious PDF — malware analysis report

Static analysis result for SHA-256 e56480cd7032f1ce…

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 07:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d8deafe6f3eca30f7d5ad7ca0dd0a317 SHA-1: df37bb7ad3c744747c262bb91516e5b0e1ebd215 SHA-256: e56480cd7032f1ceeda3d69300da5fc56c04a98444bbe14d9c98a30c31ee0b74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting domains, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ketchas.ru/uplcv?utm_term=email+portal+office PDF link annotation
    • https://onderhoudnlgarantie.nl/upload/file/sodekodew.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/e7009f054db7af240f80f6f48965a01f/11642876905.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d22f2de2d5---fejanibuvelijinos.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/7515538430.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/1856765593614b194306f94.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/vujapepuribapegigavaxufo.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/vadap.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/13588666404.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/77550550536.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/70847613101.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/wazuzej.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/k2rvsnd6jm0lmj4spulfb305nu/6768469678.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109221512308746.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/35483280033.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/gubafikajorebaloka.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/vopajopurefixubajubur.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/kugakevojel.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/99991600929.pdfIn PDF document text
    • http://sb-78.ru/files/file/tojajuwiwikem.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210924111436.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/kifewusutejojozozenop.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/kezuj.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_off0000b0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A6 18244 bytes
SHA-256: 0d725eb8560ac439de089999254adc17046826191702176c9f9d23a8ce1f51c3
font_01_sfnt_off0000dfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA4 10352 bytes
SHA-256: 4fed9189c84c6a32faf4014e96a68f1c48e1bc475f99d83e665b69ebb4944eed
font_02_sfnt_off0000f705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1