Malicious PDF — malware analysis report

Static analysis result for SHA-256 233272a642f3ec5d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 07:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6ca3015ed83fdad7ec9a0473b9e55739 SHA-1: b53dc41cb5b66e601e2923acf9f31668072c87e3 SHA-256: 233272a642f3ec5de29c118cc9123ad2e0dc533ed28546343e0e883db6b5a067
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external sites, many of which appear to be compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_INVOICE_LURE' further supports the phishing pretext. While no scripts were explicitly extracted, the nature of the URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://coretry.ru/uplcv?utm_term=sentosa+fun+pass+pdf PDF link annotation
    • http://ubest.ru/images/file/kasibosozo.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/2238771497.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/18b221b8c045db05ef1ae3b97833a5a9/29721810523.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//kinerosomopaveziguzubawos.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a705d0b2b68---gizan.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/13c5dd59127cd457c41a34b9d49ca814/98913176548.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613142cf7432d---30798794265.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/92212994259.pdfIn PDF document text
    • http://caythuocnam.org/images/files/koduvimigux.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44609cc2d9---kiwosofirazofipo.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/97916c42af623345931a1099883feaa2/73188480310.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021052216455886.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/9722473222.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/zopevotunif.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/zenopukuzasodurezij.pdfIn PDF document text
    • https://777mto.com/contents//files/runivugenakugekugabizivad.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607320b65c66f---34739839827.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202107280454028582.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/s8v1p452lfabqg03h3nbml4hn5/18225567242.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/92d71d85f2aa7180ece1525adce19b1f/dadisamuro.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/15383104548.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/25f9409a32c0dd03565b680b4a31ae85/ludidimu.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/07/file/20210607_190117_157.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/98002611067.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_off0000de42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE42 18144 bytes
SHA-256: 34c728a7b83c8c314e7ecc9e5ceeb154094a53482756957a2a1067bef3c24f1a
font_01_sfnt_off00010db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C7 10428 bytes
SHA-256: 344ba9e60f1e037168112683eae23f5a0cbf12c74f85710eef92b69dad8dc7a4

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