Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8169f79a154711…

MALICIOUS

PDF

82.5 KB Created: 2021-09-14 09:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 524bd9956120306db9d8803d69d94e8f SHA-1: df8dd6f4df35e4c8fb5b5de768634fc4d70118de SHA-256: 0a8169f79a1547115fc90622031c23241f02371a803c5827840b44d2174b8f55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous external URIs and a link farm structure suggests an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the overall structure and detection results point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://seltec.io/images/uploads/files/39617160874.pdf In PDF document text
    • https://weekendtripskolkata.com/userfiles/file/mometasamil.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/gisejokimavik.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ruflvpebpvub2t4cp04jmahlo6/rusipunezojepakekowarugig.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50102126229.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/20727770887.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161301fb19f503---gitoxowuweralawofokoxapa.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/90658270868.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136030e19b35---widebobi.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/45681037710.pdfIn PDF document text
    • http://schturman.ru/files/files/mowes.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/lofofuzogodivuzuzetu.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fbd8284ef---82468193978.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/93459865963.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/gutexixufodu.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/46484762677.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/fesazisefepikuniwonedimo.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/21554695401.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/80147235325.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/pekifon.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/65987936751.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/548368367614016be29d4f.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/fojusatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=genshin+impact+redeem+primogemsPDF 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_off0000de23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE23 10952 bytes
SHA-256: 5e6aa14b9995984714b86bbd351e67ca84ddeec8ad83f38d64544db3e712cb1e
font_01_sfnt_off0000f725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF725 17668 bytes
SHA-256: 801acc135ca7b1ddd07fcfff37808f10a448a572ea6d483a294ea67ef94f5d40
font_02_sfnt_off000124c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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