Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c4d7f6c20ef732…

MALICIOUS

PDF

83.6 KB Created: 2021-09-20 16:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 10e13b56d98be0efccb17410a46dde14 SHA-1: 607c34685d0be0584bdcf0e898ebda11e8b1af2f SHA-256: 94c4d7f6c20ef7322972a2216a4a56fbd3c4b57ebe14b3f955bf45f9f2d5b9c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains embedded JavaScript and numerous external links, some of which point to compromised WordPress upload storage or are part of a link farm on disposable hosting. These elements suggest an attempt to redirect users to malicious or phishing content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kaitosushisb.com/uploads/files/95914266393.pdf In PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021914124977077.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/xasatemewijesumib.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9940180e1---lefedexuw.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/89424008380.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/69505134624.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/17696318758.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/kisawasunefixewogi.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/64254841567.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/cac29d9979fa338c21b0996fb52887ee/zikudufudetixosivijaw.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/86322574602.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/levewiputubujunite.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/limezumadokoditizebiz.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140aa324397d---85032784998.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/8971820966.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161483023507ca---31551028158.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/xiroranunotojake.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/11251086320.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/mozixirenatomepanob.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/karewazudaxapomusi.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/99944390401.pdfIn PDF document text
    • http://viettruss.com/upload/file/vedosexomukexup.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/xubajamivu.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/44037871167.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/68959326767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=war+machines+cheats+2020PDF 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_off0000e27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 17552 bytes
SHA-256: 92351dad86a6c38820e743a8b396dbfad23f1b5d5b133857568ffb5fa4dd225d
font_01_sfnt_off0001108e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108E 10564 bytes
SHA-256: f15ae953fe6d9ba7b06a5959f2d99878f4216b56d61db27d84bd35c10b4f48c1
font_02_sfnt_off00012894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12894 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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