Malicious PDF — malware analysis report

Static analysis result for SHA-256 e823909ff98221f5…

MALICIOUS

PDF

72.3 KB Created: 2021-09-18 00:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8eb33784df7601b78741a61cbdb125e9 SHA-1: 475625c28107302a7d57194a42a13cba5c3f44ff SHA-256: e823909ff98221f5710ad7334ced59777f9d3666a25379c8b37ac3e452e65e6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://hzdsbg.com/uploadfile/1631912430.pdf In PDF document text
    • http://christmaslandint.com/userfiles/12029102443.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613e56f8e59be---nezikubogifimodad.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/litobuzabakunaduwo.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/46883505141.pdfIn PDF document text
    • http://madeirashopping.com/userfiles/file/xokobumudazowivap.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/13468309559.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/71443740866.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/84067420279.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/tevadugemulivo.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/pibepajakegiditezulog.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16140e42ca85ed---lugix.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d78954645---64956762764.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/16346296586.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/taputato.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/32172662772.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/17601673812.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/92597010711.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/nuxojalevaxowudopaj.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/kesasixaniw.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/1815075279.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1cdb07c82872cdc72e5bb4e287d6d96b/75108000370.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/67752679969.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/winusanivubuvob.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133287462c9e---51678811672.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/xewinef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sonic+manic+download+android+apk+alphaPDF 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_off0000b9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EE 16308 bytes
SHA-256: 4f80b0d539d47414c9042b11bc6dd2728cfa8f90eabcc705ca6ecb0c1c5f681e
font_01_sfnt_off0000e3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A6 10636 bytes
SHA-256: dde888b3f1b0bdf1c88bf4cb820988aa74db98216059b26c6cdf0f6c61706e57
font_02_sfnt_off0000fbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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