Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3fcda3b4f571bde…

MALICIOUS

PDF

72.1 KB Created: 2021-09-27 22:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7d724c0619130a0cbe35ddb39a7139c8 SHA-1: ca02c33862f91a4befd5b44a7058d10ae49af6bd SHA-256: d3fcda3b4f571bde62c150e80280e69a820bbf74c723fb117b8c01eb69dde4a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript may be used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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=bengali+movie+download+free+site PDF link annotation
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/fanofilutotubufokop.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/debopepiduvej.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d4b1deccd7028bd72596db441d354350/fodomumemixab.pdfIn PDF document text
    • https://vendax.ro/files/file/68954174838.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/ruviwexebupiziliwaza.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/12808575505.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139270403b13---88603793737.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/76041110398.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/opukebikanumeloda.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b14d7aeba7---73901938689.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/jorunibolivoni.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/zokozamejewepotegox.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/ritaso.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/ligito.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/vizalemix.pdfIn PDF document text
    • https://rajaunited.com/contents/files/46488402318.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-14/20210914141708831375.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/loferelosujuz.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/ropemetalulevalilix.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/72764156591.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/farofo.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/vuvadetuled.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/batanelisapagedelirav.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/xesukavisilubeduvaro.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_off0000b5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A4 10904 bytes
SHA-256: b4eb1790f06e4c2a712c5a495899e3d62e27f4ef7dee81147369788c88bfca59
font_01_sfnt_off0000cec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D2 17236 bytes
SHA-256: 685699d29a407208004c1e659c4b70038e3be9c23f01532cc9fc0d00883ce79b

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