Malicious PDF — malware analysis report

Static analysis result for SHA-256 3822ebd871d3cad3…

MALICIOUS

PDF

111.4 KB Created: 2021-09-22 15:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 30603ba00dc58fb773c495ecb6e52fac SHA-1: 578636759e4eb2f42c086d0849fb2c9472e9bc98 SHA-256: 3822ebd871d3cad391b81469912cbd5844ee2100a5e227b2d8e1a1b6c3060f7d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be disposable or compromised, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer a link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://nomylo.ru/uplcv?utm_term=postal+code+pandi+bulacan PDF link annotation
    • http://lso-msm.com/userfiles/file/kolikakofos.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/kifupe.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/41552040245.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/tifipenetapewilotabube.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614adf6a5ad76---poxevizasemowejuko.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/64194209417.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/femalafas.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/31167015513.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/77453269331.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/dotima.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/18046234183.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/53653394995.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/952162f3a961b8759ba609d49bc20e8b/67046612839.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/95764742989.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/tagod.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/75665088569.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/xererovojagoxasolavarize.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/geketugexizupodabipoxub.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/26663464348.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/vekitipobijiguraneletana.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/xuminekojumi.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/tixutixolufilapaxal.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/pozarazimu.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/pezimod.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161367a911b28b---tazejiv.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/23220308030.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_off00014c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C72 20148 bytes
SHA-256: 2dfe4a380ba8ffa27237132673d046c4bb1f973ffba0fa18f4c17340b15e9713
font_01_sfnt_off00017f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001975e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1975E 10648 bytes
SHA-256: 8b7ab332e9ccb34d7d2edd45046672a7f73558b7410b1bc86d86b3d6bb539cfb

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