Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b73177dda95ddec…

MALICIOUS

PDF

78.9 KB Created: 2021-09-06 17:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e73a9fba1fd8c2b6377b57a5edcab096 SHA-1: 003d805505c1164856f94381015375c574896ef5 SHA-256: 9b73177dda95ddec6d9b9fec084fe751016da375afbc35093c03df60151e7da2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malicious content. The primary function appears to be a link farm designed to distribute traffic across various potentially compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 6

  • 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.
  • 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://vpmemorial.net/images/file/mojovinaburefobafuku.pdf In PDF document text
    • http://systemsbiology.at/uploads/assets/file/98188616298.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/24640010443.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b962d9466d---nadoredaxer.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095556169a1c---fanawiluves.pdfIn PDF document text
    • http://flomojapan.com/upload/files/96367979909.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/cb22a922ce18590b5876e21d514fdbd9/63695411555.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/41372833473.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bc11164ce98---59312905194.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ded32581ce7---65479885453.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/77750079973.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/dozirugirizozatutisogiw.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/67547251032.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/35827931739.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/betiboketavopinozulajo.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/nububo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aff8019506e---lomujuxegalajakutikefisa.pdfIn PDF document text
    • https://path.mn/userfiles/files/15430762850.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/21351804477.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/xipexitupome.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1612e2a45e5bbf---moxafu.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021081604444673499.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/lusuzesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=heating+curve%2Fcalorimetry+worksheet+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BB 17644 bytes
SHA-256: 995ed40a8469fd3c1f0e5e4d66bb8f77054aa5e0dde2803df2e3f18ce2a8bfba
font_01_sfnt_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108ED 11160 bytes
SHA-256: 66cda59b021e091559455e37e73cc830b0a619b948b1faa85d94cdcdd65aff92
font_03_sfnt_off000122e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E6 2008 bytes
SHA-256: 85c3ddddc6d026aa0dd2a1742be550fb251a7b94ed2d09d1285587d65765b752

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