Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e0cf4418e2a502…

MALICIOUS

PDF

86.0 KB Created: 2021-09-23 15:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 44dd1d435f18a6370afdf5239a067be4 SHA-1: 55c096f08a4b674dc92d636bdcbb42a549bc0e04 SHA-256: 88e0cf4418e2a502eadaac81c3719d409001d755bab990b8eda07162539f8019
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://pistant.ru/uplcv?utm_term=backup+smartphone+to+pc PDF link annotation
    • http://vwtint.com/userData/board/file/savuguvorovinalasokamun.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/90475123457.pdfIn PDF document text
    • http://partiaweb.ir/upload/files/nipekikeboxepezefivifo.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/68070911333.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/nobavilorikiza.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/fakivusemezajezek.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/pilizisilopuxizasave.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/43098120224.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614327e87b515---vinekagupomovulofaneliw.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/fuguzu.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145485eb0b93---gofobokalovepag.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210908235501.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/rawilemore.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210907144353_1632117619.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/47346747262.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/68721776538.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/wajafok.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/kosipinamirupivasuvane.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309d720be87---bexudelajavibarobolitefi.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/latamuxupasawowurevuv.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/18344852302.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/81125090597.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/fuvokadekozosunasuridur.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/luwazonofuratativazimofu.pdfIn PDF document text
    • http://mutitar.com/user_img/files/31084935553.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/jametejomo.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021917254166285.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/688bbitit0kqujjc39v6flmikl/terutijonegokudizujonom.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_off0000ec21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 17528 bytes
SHA-256: 9e5b80da2dc58fc43bb74f9340da857075a2968a1c07f3f85a0ef08d689937b6
font_01_sfnt_off00011955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11955 10748 bytes
SHA-256: 4ee962f204af474ef3ea03611d903b0a94f57cb08faba99de62adc46405ae94c
font_02_sfnt_off000131f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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