Malicious PDF — malware analysis report

Static analysis result for SHA-256 81858225ad13f724…

MALICIOUS

PDF

70.7 KB Created: 2021-09-01 05:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9acc389d46cf7ab41455c1c2087ca9ff SHA-1: 8d6a1397379477f7c6467638d75c8ff07a0f11b5 SHA-256: 81858225ad13f724a5153a8d7a1e186af22eb8854719d9c1dbfff2e618dc041f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://inwebjor.ru/uplcv?utm_term=the+incredibles+mp4 PDF link annotation
    • http://duancanhotot.com/upload/files/68036916223.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/lamitutalutivewokizejorip.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/siluvo.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/5t1u3dl867q7jmk91q44d92sk1/5161170709.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/qfmcs2gu84jgc76vd7mr97cn5b/18223586734.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088716157d8a---lomefowiwogesikutepopu.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/71508452420.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/zizisomez.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/vabijagubekuvolurezukefo.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/52177080981.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/b460bc3dcd39209bc6c0daf83b717364/68016336713.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d12518fddfd9026bf69f64aadb0c0327/menujolobivaliliso.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/543bec2c0de99fb812b94d22dd52c3e6/galavorexesunidopejis.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/1c175967f4123eb60154ce6710dbaf1f/vulijewokekadosipup.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/51260591795.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa4f6d0f0---lemigufidur.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/51a58533c036d710f310ecbe6ea1d2bb/xufepukasokojafuvol.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/8112767004.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/gaxodabowe.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107fe8a2ee9b---koloviguxirezemup.pdfIn PDF document text
    • http://lucann.com/Upload/file/balapimokebaxikosujojip.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afddf2650c2---11677471570.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_off0000b614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB614 15552 bytes
SHA-256: 82de09825d705137468f3c3ea9c44a95b058d466120ef6e2288c457a08dc601f
font_01_sfnt_off0000dd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5B 10580 bytes
SHA-256: a24baa759b5ff429789a371efac440b716a610f06e47fa21a7fb5c1e96720ece
font_02_sfnt_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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