Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b6f017eebb83d9…

MALICIOUS

PDF

99.6 KB Created: 2021-08-03 15:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0976c4bd3e0bcd142fb8404d7f2f717b SHA-1: 5023197083d61fcde9d79ff50a6a17bd383d4925 SHA-256: 75b6f017eebb83d973e2ebd6e9b590a4e88440c79ad76a72d2f03c34487a3a74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://drafthe.ru/uplcv?utm_term=reality+tv+show+proposal+sample+pdf PDF link annotation
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97132700920.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/42165280762.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b87bce4b53---74388935235.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/7gbbnb7ut8ul9g6li9i27mn8dv/rukagokikikoretalaliwu.pdfIn PDF document text
    • http://sogelec-eng.com/files/ckfinder/files/71507203541.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/fopabokegudavejop.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100410def8bd---36454766517.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bb081fd13---metemoledubukezugatogoka.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/92820257249.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/51227612701.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/tedofavasiror.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091a51a18792---logekoxedoxamopopesokifa.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/jifebixivarexaki.pdfIn PDF document text
    • http://wshs67rocks.com/clients/9/94/942520bde836a0b401740df6f3d23d35/File/musimefoza.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161043a69df06a---36340716752.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/20762892827.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/tawanadelovumogoxobitete.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/78d03imgtph7mrddcahnov9dc4/nedesan.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160761f14a23f5---paxalibiwame.pdfIn PDF document text
    • https://xigmatek.com/upload/files/48681890396.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/zuwidimufuwasunutu.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/zimevex.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/304d04dff8e5cb5995f67a9f2b6399e3/lunerelusu.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/23340259902.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/xuruluxodulo.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/seronadogiwen.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_off000121c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C3 17408 bytes
SHA-256: 220cd6f1662884298e7d6b656737bea84f716e916c4cd8b90a2ead0cc38e5134
font_01_sfnt_off00014edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EDF 10968 bytes
SHA-256: 377597f4a01f00ec802c46a62bcd2e58dd44c42d8a799fcedff39c529c9f9f40
font_02_sfnt_off0001686e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1686E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1