Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99d2eb909175d09…

MALICIOUS

PDF

133.8 KB Created: 2021-07-29 18:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 733508c3a09a621a78e50436b8100ac7 SHA-1: 88746fa4dc9dc2f6424e036418db215903af1516 SHA-256: a99d2eb909175d096937f37eb2b813fc62244313a1713706f69893ee85ae6fd9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://ketchas.ru/uplcv?utm_term=the+legend+of+zelda+ocarina+of+time+master+quest+differences PDF link annotation
    • https://biocoils.com/img/file/kunare.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/5fvpb1nj9h8fjg3soc6m9iq6ka/26449675578.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/56365049262.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/8rgru8qaemeulpphq2n5d66kf5/26981815446.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ifp1e6paf8k1d4sv3tevahaqqt/zotenapawoxasetigopik.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610118558941b---kulejiw.pdfIn PDF document text
    • http://redsky.tv/userfiles/files/fitifuxevumaporakep.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b08f364362---levudejuv.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d508541d87afd5fcb03825cb3f6572fa/binomemixiwolevufo.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713c07f16d2---11877017347.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/26732e0555bb4bc999dc5cd721e8e217/vusinosuwifitarenafek.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/47946608101.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/8ceuqoo10no8nnmlphvj46fbl6/63498861456.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/38a387b2940648def53d2c5b43580b21/47509854916.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/xavinevutaxo.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/55306792755.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16072ea708690f---61901338546.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ujmrm5655h11kec2g3ncav0gv5/jimejeloxexeta.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/u7png6q3oggkrt41ba3ioea9b0/75717366153.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/mumebobaxupimi.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609760802e0c4---gaxuxoxabaliki.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160be4347358d7---gugirazolorisanasinazob.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609762b79878f---wubekukosivunawupesilifid.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A23 17896 bytes
SHA-256: 113918dd2bb5198945732c8a0e4082bda6449d814396442df7754455d2525048
font_01_sfnt_off0001b8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8F5 11192 bytes
SHA-256: 67c9242e88f8af336c624d1142f475c9ee097ef2e8c15732ddb92f0d5cf82143
font_02_sfnt_off0001d280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001ea8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA8D 8676 bytes
SHA-256: 9cff7abd067dd940d9ae664650d7cb121bcbc51c3babed2210f52daa6d69256d

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