Malicious PDF — malware analysis report

Static analysis result for SHA-256 9350d7e3f0c2f1e7…

MALICIOUS

PDF

84.2 KB Created: 2021-09-08 10:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e049bf0fa7c15d72082287bdb8bf5ac8 SHA-1: 6b56b90b2a5d0c1ae8fd8e63469088baf12f3c41 SHA-256: 9350d7e3f0c2f1e7e4f1f69b78d97ac4a1b393db8864cafe7d9194a38e38279e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV also detecting it as Pdf.Phishing.Trojan. The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://ganganagardentist.com/userfiles/file/11859781371.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cf928f82a---23156788584.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/enu18a3onl2t6u879ebegi9sru/rimikeja.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/zexomazolabufuwax.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/213762990.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/lujenavadaduxa.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fcc1d082d72---tawotafometejarivorutamo.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/bafupawi.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/fejixivuxawatixivexid.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16071c906b0948---50718012966.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/jabisowodaxogafijimepakad.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/87487619840.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/manufugit.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/43081131073.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/gedujob.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/f94dc73cc2840d5d44135fbef9d66bac/47000434748.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/354269998d3dab87fae58a01272d5e9c/jamuxari.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/3c9982742fa76e11f36515ec1c57da3e/bulopezaxitazolivefama.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/826544642.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ir98hu2hg26t3voem3r2p94gul/jumumodukapebo.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773ee49496b---samerelomagiwujoj.pdfIn PDF document text
    • https://thietbigas.net/media/files/55840973940.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8464c58d64---sulisoluxivawegesabo.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0d0e3b90f---32034632.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/wejedokijosokusa.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021626194516322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sss+obstetrical+history+form+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_off0000e0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DF 11108 bytes
SHA-256: c1bb9c3ac2fd5bf350f3c2917c8f3b5e4dab1380f1775d790ec18564a6fdf7d7
font_02_sfnt_off00011291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11291 18616 bytes
SHA-256: 5264bf4b6a8704ec45380eed3d463eca89480f5d018de0f9057e055ec52d848c