Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5a16d17448afa3…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 10:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c4991ab29a82d2ed6d7b359ab5f18e8b SHA-1: a00971e4bfccabfa8f7d7fa4b9f3291339f36b73 SHA-256: db5a16d17448afa3a37242ea36479952728d05dce14552a9985d1855da2d43a8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with a small text footprint and containing numerous external links. Several heuristics indicate it's a link farm hosted on potentially disposable or compromised domains, designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://www.pics4us.de/userfiles/file/xajavikoketaxixiwubur.pdf In PDF document text
    • https://profitaler.com/UserFiles/file/84970422727.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631777806sadalur.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/dimixamufidumalur.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/xiguluvu.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/52117753715.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/10757358468.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/4bfcb426aadd1752519308ac1f457138/derin.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/86331485402.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/gatapawugesawer.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/3299518347.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/dovokizujowanaxuselogo.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/46577258506.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/pinopigakivevawudulesowi.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/xigoximomusokudak.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/xoxapodiku.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/vupakalowupezelutawe.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16147e5fee3086---ruvifuxuveg.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614cfcb492653---togifawimiwapemunoputeg.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/23698616178.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3455d737f---jivonolu.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/71ec9a6ad16c56eedfaa130dcfc3e2dd/towixadeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=harry+potter+1+full+movie+download+with+sinhala+subtitlesPDF 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_off0000ad93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AA 11312 bytes
SHA-256: b81f82fe48c5218146964f1a7a1d83a11dcf96f3b34cad34afcf860df70e8e73
font_02_sfnt_off0000dfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEA 14360 bytes
SHA-256: 13268586a1bfbc69d8e7b1bfd854d7ffe516692555698dd09abec4f82ff95bb9

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