Malicious PDF — malware analysis report

Static analysis result for SHA-256 be49c92e1002845f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 20:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d8b31a08a781ad26a1dcf09c6d20e2f2 SHA-1: 997bbdb4e0b9e73228e3573ab21d75fc77ddac85 SHA-256: be49c92e1002845f151a0fd010710fc3adf550493ab2dbc568bfa522618e3ac1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous links to compromised WordPress sites and disposable hosting suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/v83qbf38ea3obg88mnm32gpnul/77371531548.pdf In PDF document text
    • http://www.allatpatikapecs.hu/images/file/17338536957.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813aae80251---kefij.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/82689185726.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8ae779aac---32075535408.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/zivagite.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/01fd89250838c2ededd7ddeae30d34af/24278971266.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/bapobezadezubi.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607897f4ef43f---11717196385.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/mebexedajazodixamadunu.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/96787453091.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f4d8d600f---dixozalakiwitakevu.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/75953149599.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/pibegujutifepuzarojolusol.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/5259035379.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609300cf9af8e---zinuxejagudavege.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/nijij.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/46733118222.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d6d2ce4a1---11193452036.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/folunate.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/1jd8vcadlenpv0kuuegkgbcct3/tobuzisajakipik.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/suzuxuwabis.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7a30a86deb69c0a88314524aee8c8cb3/41280412713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=fish+psychopathology+pdf+free+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62D 17964 bytes
SHA-256: 0649d972b4e8d92a03f397bf6ab7f3423b1564f71a89c8a19e0417b43df8d561
font_01_sfnt_off00010505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10505 11076 bytes
SHA-256: ef90a9209fd62c9ddfe76b48dcbc7179a5f3e0eaecd843b93660a557756eea14
font_02_sfnt_off00011eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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