Malicious PDF — malware analysis report

Static analysis result for SHA-256 5613437d2d3765c0…

MALICIOUS

PDF

78.3 KB Created: 2021-09-02 21:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: be42ebe0ac0ffd260d3014600cb2c400 SHA-1: c893e8548c69fe8c181c3de194d247f81698ccee SHA-256: 5613437d2d3765c049f7cb625cf4f79ff82086487e2fb2c97f1d776db1c4f0ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially compromised websites. These factors, combined with ClamAV detection and ML classification, strongly indicate a malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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 https://archism.ru/uplcv?utm_term=gestion+de+compras+pdf+paraninfo PDF link annotation
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/39523170481.pdfIn PDF document text
    • https://palet-school.com/files/files/xagilexup.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16085ac589cebc---sagisamukuwiwotajutudobo.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/dikodigemodusona.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/vdl8t8efijavct9n8aim8mngko/22535399521.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/45808829127.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/45f296dfdb62342dca395c1cd37bf380/zidomevozenole.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/7190132419.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/914f56a760a90465acd40409bb7247af/nonazadolo.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/26ce0f42bebb8e54c7f8a6d31762e95e/43734372611.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/66959596356.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/23da38eb1ff5c8a7a134d0fa70183af0/dotowurin.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/41628658250.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075f09ec1c72---74167182007.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/46124319851.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/54101633714.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/0af6d8d9308e25cf507b4a86d1da795b/80718765756.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/jokixibu.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/4d32527e2499a1df6305b062c573f605/10601129489.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/59927042538.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/k67al8ral5re1hmqdnm5ns8tma/fupipuwux.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/suxoni.pdfIn PDF document text
    • http://mega.kz/media/upload/files/xoxaruwekirirok.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d40a0996b8f---fokefewidepazepozanisepig.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5732cbf80---33505176626.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/goxugoda.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160888fbf380aa---67446565433.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_off0000c9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E8 19092 bytes
SHA-256: 0fc7566c88c009dc70156842248d2fc38feb6c5114f60d1734237b551d181d46
font_01_sfnt_off0000fadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 10776 bytes
SHA-256: 372cad8435ef7364caeae55231c396d4e76c6ca1461a882240584255f7af6b11

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