Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e81e00c070d343…

MALICIOUS

PDF

76.0 KB Created: 2021-08-15 12:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad9e98ae764923b457f9b08eadf1d351 SHA-1: 7d3d502f58babb39da9d00c794ec32f254e94ac7 SHA-256: 66e81e00c070d34317fdb1eb8767dc79b48014225ae2b99eedce0b136ef1dcc2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of a second-stage payload.

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 https://pistant.ru/uplcv?utm_term=histologia+de+ross+7ma+edicion+pdf+gratis PDF link annotation
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/217kaja6cjv0eg77th4uv5vh01/fijolipisiba.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/ujrkv2lfvteggnqcn0g974m0rg/99105598006.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5a6e6755a---bepewapokubeviba.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/jumojaxuvuminopodegabis.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f173a95ff---dizokalawinixisupewabena.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/tofuletogerisu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161003c47c9e72---pulisojajideximuwez.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/kavefunazu.pdfIn PDF document text
    • http://kme-kme.cz/files/file/kevipimupibavipuraler.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/ximolokoxesekotema.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/zipisegedolixatowonutora.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/kdn6iei3442mt1dnn237qqavb0/tawakarovozupawulisotit.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16084e8086f4e2---bilodafegite.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/zedoxifus.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/xefamugaxevakena.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080600828224---37932939237.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/6d55f0d73098d6e945a4702e18659872/zofigidinamutoxenimapom.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4e5dafb54---79456160459.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/lobitapisilidizox.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/53116916827.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/23f6225a2caae48a7c002e45cf9f1e20/gejopedemadovafoti.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/2381d87d3c9e8b516e6525cfe397f276/seporirodusa.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/3f1654c632920fe1ed5237eb8b9e0f74/53103215416.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/puwekarulonikudinedozotit.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/26559179256.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_off0000c36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36E 17000 bytes
SHA-256: f85607032f61db67e3cdf49ae304f085986bb839d9ee1c63907a9dcab40f430d
font_01_sfnt_off0000eeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C7 11004 bytes
SHA-256: 75844c02aa76c75b79259008182a886c48c7d0865bc3b652a5b0b24d6aa8aa07

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