Malicious PDF — malware analysis report

Static analysis result for SHA-256 612fc24901d69140…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 14:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d543b7255185e56a36613b18f00cdc39 SHA-1: bae8a3b7ddab39069fd8cefbec401e50a39f60df SHA-256: 612fc24901d691402f0061798b492f9891427fb989e972af0dc7f59f798d22e5
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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://coretry.ru/uplcv?utm_term=cut+the+rope+2+mod PDF link annotation
    • https://cremyco.com/app/webroot/docs/file/repobejuzoxuxisijetuwe.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/moguvoxavovigibe.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135aeedecd30---savafudow.pdfIn PDF document text
    • http://svx.su/ffile/file/fuzukokigunokenaf.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ac4f54270---jetudizazin.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/riponeligamatadojilozeb.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/gaboninu.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/f5d1a8f564e9ecbb2fb36d3ca1f0157d/83417568105.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/zusiwofaxodugevazera.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/41016798309.pdfIn PDF document text
    • http://iwort.de/userfiles/file/48245682222.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/91629394384.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613111550a161---xabowoselixakiwutefutu.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/5f003d9feaa66f3964232fedc13caf88/revonugubakobajugeviwo.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138fe2a298fd---mexalofugositulazapav.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/56091154178.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/3802203711.pdfIn PDF document text
    • https://rm-parketi.si/uploads/8920968918.pdfIn PDF document text
    • https://uudanbury.life/files/file/sevasinuxomovejepexate.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/sikusopos.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/75448658083.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/zomejinibozunuz.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/tolenove.pdfIn PDF document text
    • http://canvangdientu.com/images/file/sepeliwara.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_off0000dec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DF 10336 bytes
SHA-256: e717c1e66313bf265cc37e1195f116fe38a2c01b27e20ee72f73f52082ca98f1
font_02_sfnt_off00010e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E47 18084 bytes
SHA-256: 45c549410cb8bad96203a29dc16a2a6aa88e89c8753c4a48f194201c615c12d3

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