Malicious PDF — malware analysis report

Static analysis result for SHA-256 36811afbcdeb09a7…

MALICIOUS

PDF

82.8 KB Created: 2021-08-30 14:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af6e25e9b4c00385135c2db4479e7a20 SHA-1: 917f3a69643a6cbe8d1d8cfe8624d3cb54f7c3e0 SHA-256: 36811afbcdeb09a79c5c62c0411112a969713c480cf9765bb6e50515e9c4e208
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to malicious sites, contributing to the overall phishing and malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://www.ishvani.com/www/js/ckfinder/userfiles/files/pokozedefidenoj.pdf In PDF document text
    • http://rolmech-strzelno.pl/Upload/file/51305958819.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29ec0050e9---86058713653.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ab27e4b3e5---30119122784.pdfIn PDF document text
    • https://sealskinz.ru/files/file/jedusofogujejenezux.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092510c04270---32956534691.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/17221525565.pdfIn PDF document text
    • https://lod.la/images/news/file/1901051274.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/4ed3cb846f9609fe6bafd367ea88cc54/kabaso.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a40dd1498c6---mewisugojuzulazora.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4e268e00b---wejatizisulodetokudokeju.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/kiwewedobatubapiwo.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/37301001663.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/3093017402.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/eeqdbkmj63oo929mtpt8vbvtf7/47410558989.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210531102734.pdfIn PDF document text
    • https://ancoraeducacion.com/images/983529888.pdfIn PDF document text
    • http://clintonseniorhighclassof77.com/clients/e/ec/ec6cde7faca09d53f5ba1fe44cd32e38/File/88206264396.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/3fcf1f3e7cc79ba7e1e6a94e7a4f7380/bajoronimadusijasoruz.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/xizudad.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/67403780868.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/josituk.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d09349152---63403355665.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d80eb678eef---48933419481.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/fekiwolan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=coating+and+ductingPDF 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_off0000de83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE83 10232 bytes
SHA-256: 4de4a612d04ced9c1288c77852f3cfc45fa062e7d728297ae2dcbe687e7fc243
font_01_sfnt_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 18040 bytes
SHA-256: 09b59d60afb180a027ef8cbb519e1b7505fcca899d79d444accce81c73c8361d
font_02_sfnt_off00012442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12442 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1