Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae03899c9e6065c2…

MALICIOUS

PDF

72.2 KB Created: 2021-09-06 17:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5a604f42ef2cc26bd095b83313097c6e SHA-1: 4f09941ca7a7ccaa3f849283611446fbd8778ffa SHA-256: ae03899c9e6065c27843c3cc9677646a586e5ad675dee518581a19ad9e47a4ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The presence of external URIs and link farm heuristics suggests the document is designed to redirect users to potentially harmful sites, likely for phishing or malware delivery. No scripts were extracted from this sample, but the overall structure and URL distribution point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=from+jpg+to+pdf+converter PDF link annotation
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9558586089.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d295ec88de0---81341289251.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/dmdke94fk6o16eg67pp34em7mc/48623785772.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ut2sfci0erchdajo00lgf2i8eh/dugaretumuzatawas.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/64659818529.pdfIn PDF document text
    • http://cedarvalekansas.com/clients/875954/File/39364814098.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/wevugusetevadilisup.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/tadigenisoxago.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/ladazuk.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i8fk44ifr6reabdj6214ib82r6/baduxipomuzekerotaxepuzi.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210701205327120.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/fodubowosababinaxexi.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccc8fe5127---78288514441.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/638dcada99f0b46f81f09c553ae50981/nifupowasavudimi.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/28f442641691ce66cd257254072a2622/jejizutib.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/toxufixenavejadipu.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/bodojapekogipozufi.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/94638224107.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609795b07cb0a---lawobizo.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/givowubuvuvuwawuwukapib.pdfIn PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/jobozetipobalefuwagaze.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/61613262250.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/9589469808.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/xoxumigizutowox.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_off0000b8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10E 10668 bytes
SHA-256: c594a1c509f666f36f00cab0ef5586ddf4e92add870907ea9d52529046edc143
font_02_sfnt_off0000e94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94E 16480 bytes
SHA-256: 5033d7fc3ae82b03aee22bf3de0c7170de4971045f4faf2272c3ba301d13be04