Malicious PDF — malware analysis report

Static analysis result for SHA-256 88cefff2ecba52aa…

MALICIOUS

PDF

69.9 KB Created: 2021-09-29 04:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6fc5a7bb2cb4413415f9d1c0a56734dc SHA-1: ed63c48a9b05b3dbcb37d5d9237d9956640bbc1e SHA-256: 88cefff2ecba52aa178a56b1edaba5155c9246e18756a080f54c78a931d1f876
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The embedded URLs, such as 'https://inwebjor.ru/uplcv?utm_term=dead+target+2+hack+version+download', are likely used to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://inwebjor.ru/uplcv?utm_term=dead+target+2+hack+version+download PDF link annotation
    • http://roycraft.ca/userfiles/file/xipidiralaropej.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/benojilapofo.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/nifegonowezaxuweke.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/belesafegifetopufemeni.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/pufijufejodavaxepuvalo.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/wirotovetapololuxenebibud.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144e78771f66---69123586527.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/24455744905.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/totonowemi.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/38895009614.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/jewoborirusoxalatubon.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210925001052.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/55388015858.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/51275844035.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/97998888174.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16150f16a18d3a---38107910446.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/88ree9vbi3qg07f5bpfc39vaa8/2455059400.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/fefazuj.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e76b8671a4---sigixegaruzudezugu.pdfIn PDF document text
    • http://youil.org/userData/board/file/fumizukotu.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/wepaxu.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/17029326065.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/99407642274.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/winefajalikemuxewabap.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_off0000b021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC838 11016 bytes
SHA-256: 69263da3834e493d8ba6e06974b23ab464420194df414df02c5105fdcf6801a1
font_02_sfnt_off0000e1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AD 15972 bytes
SHA-256: bf5022b49a78d65b79fc18f393de2667c9c2ab1031bcef0e383ee63dd8b718fa

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