Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38742c65fbe33bf…

MALICIOUS

PDF

76.4 KB Created: 2021-09-06 15:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a3b3a015cf1da48607fd6c2f5de5b1a4 SHA-1: 84a218666702b27cbff824b4111fb394adc9d124 SHA-256: d38742c65fbe33bf147f015510d4b03f9ff8f70afcb605bf6f9bab44e3d78c69
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 0.9943

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 http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911d58bb26f---posazazidimojipojerenaf.pdf In PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/63923992744.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/sozofosisagivesusu.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee35ce7937---noxesanapawenetulag.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/salejipidajolonubedisage.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/58481408e4f0612c208b2997fe4b4c34/wozuleroxozasexosigug.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/luxojozulipew.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/84735164885.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/viviresurigoruxelulokos.pdfIn PDF document text
    • https://sbufficio.it/file/46312187328.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/44abbfa1770cd228bdd39ad5475b90ed/42500390376.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e820b518854---83836958697.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/941806fbcb62f376bc96204e2da8972c/kiwodajor.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca58e6adc5---10528226656.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4083c39d69---2045757139.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/30054685080.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/89kh7c5prbhspi4hrbgeds383b/vebafokudaf.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/tapufateromojedefabak.pdfIn PDF document text
    • http://mesterek.net/tmp/gorapik.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/iiv4anashvk02bre01brvlm018/85803812705.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/1005994510.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/98245213446.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16117c420d308e---sivux.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/15467254387.pdfIn PDF document text
    • http://qzgj.cn/upload/file/29313819617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=fuzzy+logic+washing+machine+pdfPDF 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_off0000c70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70B 11204 bytes
SHA-256: 725f6dd9a75f1dce5be7886a2649387dbcb2d637ec24c2628303d1dde1138863
font_01_sfnt_off0000e0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF909 16620 bytes
SHA-256: ff4d6490eabfd27f29e7d279756468b913192b6f6db11ce83cfb6bafe45f37f2