Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d396fbf81df670d…

MALICIOUS

PDF

78.2 KB Created: 2021-09-19 12:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 58bd98e11a56e681fc1bc4dc3d068ad7 SHA-1: b0c92294963184a87de2c3bcead099eb65754e9c SHA-256: 1d396fbf81df670dd6fedd58af0da42ea3c8e379154b567388dbdbd16e56bd55
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing a browser extension or update, a common tactic for credential theft or malware installation. The PDF also contains numerous links to external sites, some of which are hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://keralahappyjourney.com/ckfinder/userfiles/files/11805607189.pdf In PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/21474750474.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/terujuteje.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/konabilujo.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/fuguwor.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/jijomujadepab.pdfIn PDF document text
    • https://chp-travel.ir/data/file/femono.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/zapatodijitisijodaxixog.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407fac4d98e---fuwakuxobonavinasowodebu.pdfIn PDF document text
    • http://mrrb.nexgendevgroup.com/files/35940069125.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/pinajilomomatetak.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/69908184029.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/rigofizinomavovupugapusuk.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/44841415531.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/wunepenununedazofegot.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614437fde855b---fiwinera.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/22456780725.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/52757536135.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/35465695661.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/mefujonojavisot.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/54885581638.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/65446866113.pdfIn PDF document text
    • https://tuinvandecruys.be/file/2729297451.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/42525342444.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/balowuzokitevo.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/50998115985.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/jawizid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=spring+potential+energy+unitsPDF 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_off0000ccfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFD 10716 bytes
SHA-256: a207a24ddb2f3d90be5eba20d77bcf668b6c840cd57c34860acd6d574c527fc1
font_01_sfnt_off0000e5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC7 18184 bytes
SHA-256: 50fb84b0d990102a331b427799ae5e2d82d9ecd01a9757cf51738a6c72ba0232

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