Malicious PDF — malware analysis report

Static analysis result for SHA-256 244c206a19cecdcc…

MALICIOUS

PDF

88.1 KB Created: 2021-08-20 03:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 02f4b3447307efabe85067c0679e24e2 SHA-1: 881d80316fb924ebd3c1be617f30753b2c0bbb75 SHA-256: 244c206a19cecdcc0bbeb7f735d43f7167cee23c36be4083e4b8eeef80846d9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to a link farm hosted on compromised WordPress sites and disposable domains, indicating a phishing or malware distribution scheme. The file's structure and URL patterns suggest it is used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=introduccion+de+las+escuelas+penales PDF link annotation
    • http://bdn10.cz/files/file/72181721934.pdfIn PDF document text
    • https://tempegaring.com/contents//files/semaxikonosufamidite.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/putadunapib.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/64651355842.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/23453tigutdbe72v4hov2edvhf/wulezerurenurugozamogekof.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6efc4c7aa0---83556378790.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/bokimifusosomeru.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607269ff130a8---xofejopubipexen.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab04a2e81ae---67783743139.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc67b3923a4---kovewurovinoxopi.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/08dc02c0de418af2b4b075ff14183562/kebimuwizum.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021072816074796.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/80721755672.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021070317443773499.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/h91319avjadj0f2s94hmo7avsi/mixaso.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee410971dc7---22517598254.pdfIn PDF document text
    • http://asustainable.com/global/file/14464437003.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/8816020896.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/jarusagesilawudiburubom.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/nodisene.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/vawigazifisusixabimoxidu.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2b8214930---suluzez.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/vufitipelakixowoz.pdfIn PDF document text
    • http://abnicum.com/files/file/57112673342.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161128804cec26---zavataxotodep.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/rimaruvele.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fc7fd0e3ea5---94926810075.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_off0000f46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 16916 bytes
SHA-256: 54949106fa90503a0ee153c3c84e0dd764772e8a54529aa302301deeab4a8235
font_01_sfnt_off00011f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F25 10560 bytes
SHA-256: e56f3ff7242c387f63533423fa8b09eb369b4b231706c830bd277cee5436151c
font_02_sfnt_off00013753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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