Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e14f5d763bf9f83…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 06:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 33363009a9531b21b8db7c7b9f9d567f SHA-1: c897bff1c2f9c3c2fcd44302391287c159887125 SHA-256: 1e14f5d763bf9f83ac4f8caf2ba3f66628c69d9cd1ce8cbf695e7f9ee3e087bf
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://frigotechreina.com/userfiles/files/busolapuj.pdf In PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/vaxoxogozuti.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5cb4264c7---10951568982.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f69ada6d03---wopele.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/negimijesubazud.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/vitoxisawerozuxipanu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16082a740e3306---89571257752.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/wabuzujugufanu.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210814_4F00C608FE0093B0.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d286abb647---morajivegoxusijat.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fe208539a---gatijukunisojowuboxit.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/8424934116.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/2cf13a5eeeef016ac06918810603faae/maguwoxajofo.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6827a361c---siwaketupid.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/xotojemositidivizoxa.pdfIn PDF document text
    • https://turbooto.vn/upload/files/81599286549.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/wevejelaregusus.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/23414593329.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/84396629743.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/rinasev.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/biviloguvufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=biggest+loser+challenge+at+work+pdfPDF 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_off0000dca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA6 18200 bytes
SHA-256: 8a3131396791304df344f44079da0d597c1c918fe17fb5ba2a3271c4baf50ee8
font_01_sfnt_off00010bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F2 11132 bytes
SHA-256: d01ee7343488fc0308444a5cdc4ecb7ad430326cdc7915d8ec82f42f13e960b0

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