Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9999c0b2358b736…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 05:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52528f949aab2486d200a101b3cb9ada SHA-1: 4ae0d0eefcf36f50c6502938af23ec31f9aefff9 SHA-256: e9999c0b2358b7363b11f7f6c28dbd26eecd2e3e1535f5571c9dfa60aaff0e17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161408f7646693---nemotipafejuzerapogu.pdf In PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161422df3157ee---39286627368.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/xijofuse.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/74471375877.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/motubajoximofovukabatow.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/nijajotesogisabo.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/4e58a1e6721d3d35a4ea6b4bedfb1202/88832416188.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/86581073121.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/tinizete.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/zuxidukewunexagotogibef.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/55579656217.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/ruvubejuz.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/8263357768.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/56854451939.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/33694385089.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/vuzozisokefo.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/19347932688.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/rewabogevu.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210905125647.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/tuvuwuzapuvurogavobo.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/jivodenorumudejozom.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/barugiwewobateju.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/86914497827.pdfIn PDF document text
    • http://metallpress.ru/files/94135495916.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/28832022406.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/2634437385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=free+robux+for+no+human+verificationPDF 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_off0000cfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC8 17668 bytes
SHA-256: 41b80ae5154b7086997f03f206e84d33c94a1c62ff02cced05f4360a5fc05cad
font_01_sfnt_off0000fd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4D 10772 bytes
SHA-256: fa98779a96a15975015a6a31744540032fb190d7a54f82b4ed34d2df6d2e49ab
font_02_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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