Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd47251942c6a1b…

MALICIOUS

PDF

77.3 KB Created: 2021-09-18 13:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ad5b276aaef09fea04470c1677b092f SHA-1: 671e248d9dcc5a4df89dda31fd7a8233306b441e SHA-256: 3dd47251942c6a1b295d71f08d49f9e74fb6cbed63f9e61df4b2b0e7fcacdc3f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous links to external URLs, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or initiating downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/522760df848edea52c5e28c4932409d0/kojemewurera.pdf
    • https://gizaviation.com/uploads/files/37240594763.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161309dba5c711---retidesumikoteru.pdf
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/rukikoxidasuwefoz.pdf
    • http://studioferrato.it/userfiles/files/46156410844.pdf
    • http://nigerseedindia.com/uploads/72863003197.pdf
    • http://barrospizzadb.com/uploads/files/tawajujeb.pdf
    • http://www.udelimpa.es/ckfinder/userfiles/files/wefixowizimozutoxawinuz.pdf
    • http://mosjob.ru/images/file/zalofeko.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/gd38lsba8gbhebob8rs42m2lgr/kibepegirenan.pdf
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/64410951022.pdf
    • http://el-system.jp/uploads/2012/files/menuwezeji.pdf
    • https://keongracun.org/contents/files/21582222726.pdf
    • http://lollanaclinic.com/image/upload/File/17219694610.pdf
    • http://feriaalainversa.com/uploaded/files/velemoxubenirulijige.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/5e91e9057ce4617a77227f72f56f22bc/90199783053.pdf
    • http://tw-sincere.com/upfiles/editor/files/nemodobagoziwepa.pdf
    • https://cfaegaianascente.pt/portal/userfiles/files/76218425049.pdf
    • http://aal.tw/uploads/htmlupload/files/77716151081.pdf
    • https://webshopplus.nl/app/webroot/files/userfiles/files/soroxogawapi.pdf
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/dulajofukutazodo.pdf
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/85680171480.pdf
    • http://worshipedia.mobi/sites/default/files/file/36874109391.pdf
    • https://mavibusiness.it/file/norununemegag.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=tutuapp+android+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00010752.bin
8da430765a46c628f2bbf2aa23a3a4b2de88d7742d06d9a45d9c7de81e1dcdad		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10752 19260 bytes
font_00_sfnt_off0000b4b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B4 16792 bytes
font_01_sfnt_off0000cccb.bin
407a0a7cd1e7a95c26169435ac318d6718a3709076a941422830d3032ce2c1ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCB 10236 bytes
font_02_sfnt_off0000e3d3.bin
414e45b8dd69ab8fa7cacc36c456b3d22cb39d0b8cfe15439930840575db6dcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D3 14308 bytes

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