Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5950889e9d10311…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 02:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1b45e9c71f6945634f923708111222de SHA-1: 4e859418c831fedfac4ef5de5128818728ed38cc SHA-256: b5950889e9d10311db10a9a4623bf1274b2b5f5e165a81f5c6cd3379fd474e87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

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 disposable domains and compromised WordPress uploads. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=settings+app+crashes+android PDF link annotation
    • http://fcraregistration.com/UploadedData/file/1309668328.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/84358726888.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/85696297437.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/rifozovifofonowilikos.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/wetupijepinadug.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/lizedab.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/vorebupinofexikor.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/wisasisevonotafowokadi.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/vnhaddco8483h0o93lk1hl6n40/juvusaxipilavuzujedafif.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/rikarupakezogulomojukev.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161328c8ad840e---62968830.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce53787d7b---70843773599.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/92571343891.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/vokijupasopejude.pdfIn PDF document text
    • https://expomediainc.com/upload/file/86677795701.pdfIn PDF document text
    • http://tochalco.com/uploads/files/sigemekinuf.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/36036273843.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/danuzusat.pdfIn PDF document text
    • https://deepex.hu/hirek/files/rozetemamafenesoporu.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/guredoritulipofemilexu.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/63945be3a2662bb03fd639dbce826cf4/zerokejojivaro.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/80771549067.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/zulejanikufogilusuk.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/buvepikubo.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_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 17704 bytes
SHA-256: 41316b3d821d82e439fb2636b189e76d10f1887f3832623e4b09dba3892c2890
font_01_sfnt_off00010d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D72 10824 bytes
SHA-256: 10055acb83126f28d1ba6cc3ee3edb30d9244bce01a805f5a72bd22d78b88e78
font_02_sfnt_off00012623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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