Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d655a5edf49e39…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 04:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 54bdc1633b6528406185b9d83aa9cf40 SHA-1: e1192cf945bba78cce583e47c9d8310fe37e87dc SHA-256: b3d655a5edf49e3926140eaa5f33d8098b9d101423bd95bdda71bb5d331ecbd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The ML_NYX_PDF_MALICIOUS heuristic and the ClamAV detection strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://heninrealty.com/userfiles/files/37829933738.pdf In PDF document text
    • http://kiemdinhcan.com/Images_upload/files/98954988217.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bca9ebbedf---68367308478.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/nozurenufosa.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/desidunokujiwamatep.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/xemiwugulozenoruwewo.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/mesadoselugapediwebatug.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/136e22151865a6e02501d3ea1b43973a/jagur.pdfIn PDF document text
    • http://sinners-party.de/media/file/xotuvepesatomigoz.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/93633071095.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/79769694726.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/r536q8kp98f41ishntjcnhpptp/bozewusinikufuzozovo.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/zivegami.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/70910845263.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/vusego.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/piduvejapep.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090221201021.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/23001726532.pdfIn PDF document text
    • http://snsi.jp/image/news_file/poxulakeg.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/4606052994.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130ff279ee9c---zulur.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ac65e0bd6---vopaxiwuz.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc7a9ad5d6---mefubafowemajibetiropo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=flutter+reduce+apk+sizePDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/jokomivebepibosuwini.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_off0000dbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 16880 bytes
SHA-256: 561b1d0ab4bf465f1fd0ac14461098605bc1f2447d7446ae50efb30a0ae296e0
font_02_sfnt_off0001204a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204A 10512 bytes
SHA-256: dc8f8ade5d5298488b28e875146af72a1bb43f1c99dc8983947ab9d83ac06120

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