Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea044c5fb893ea2a…

MALICIOUS

PDF

73.3 KB Created: 2021-09-01 00:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1f22840919a2faed37a3b8b8bafc642f SHA-1: b0a4e1ed2e90e84900c6ce0a0a35ef3e708feef3 SHA-256: ea044c5fb893ea2a819b90ee446c1df197480f24fac586bf3ba1be316e1632fa
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites, suggesting it's used for phishing or distributing further malware. The heuristic firings confirm the presence of external URIs and link farms on disposable hosting, reinforcing the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://laborke.ru/uplcv?utm_term=gold+price+intraday PDF link annotation
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/97dabd0b7e666276255cedf9749a5551/32389264029.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/mm41k7os89qi62dei5jf4krbff/fiwusofabidetelelixeju.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c406363167---kituka.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c323ced32da---domapotojixuvufozodixutet.pdfIn PDF document text
    • https://istanajp.com/contents//files/42215977995.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f1ffce41292aa1b00610692fc2f8ea7b/71242744629.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/775a709cba4e60fd1def5f8998a7f563/97705841162.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/losatemamajarezaserukami.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/ranilerizozigu.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4f439cf7c---95856471766.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/buvoravosazoseb.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/xabugovekawuvoge.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/91528489748.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/57916467221.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610b7e873f7ad---gisenokonotopazawibapazep.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/palizuwesixogi.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/33600695784.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/gamexojanudekomawinodev.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/kogobe.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/67824604615.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/wevizilabumapi.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/59153865286.pdfIn PDF document text
    • http://sibstroiexp.ru/userfiles/file/93667723733.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_off0000bda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA1 10492 bytes
SHA-256: 415e475df2607d79a275f672f1f20fdb3eca738bcb1da9593e68cfa6775c6af2
font_01_sfnt_off0000d599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD599 16020 bytes
SHA-256: d91b07ae282b7a81ee1e3ac6f422330463f53dd7ed8db972227e3a003bdafdae
font_02_sfnt_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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