Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d528ca674a714d0…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 03:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c1f62754e6a42f3084cbc235166e973d SHA-1: ee828437932344919af99c69b1da855235d98f38 SHA-256: 9d528ca674a714d0b16e5783638bd263a3fdbd6e1e9c6a0a3538f4d633dc87d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to deliver second-stage payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://allytemp.ru/uplcv?utm_term=card+wars+kingdom+download PDF link annotation
    • http://medica-brno.com/files/bafawanipinu.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/kewakipejes.pdfIn PDF document text
    • https://kulittelor.com/contents/files/62462240276.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/daxixupasosovujewixido.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/7606460979.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/lanekovoset.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///vebofasowufarogaxigobivuw.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/757541335612f464017e32.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/dibap.pdfIn PDF document text
    • http://adice-area.com/pictures/files/titidomazumafot.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161426a22492db---reninetoliz.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/79882742155.pdfIn PDF document text
    • http://polkovnik.su/upload/file/jaxaboratibonok.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613520faeb90b---22940608770.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/3522797834.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137877abef7e---14181654537.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/22772255307.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d4f2ba027---54335398011.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/86638043428.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/zilotokulu.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/pomebenufilejobuwitot.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613871af096c7---xufefejun.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/18953606709.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/3456a6cb43f379cee16579d01dc8156a/vodotumusufutuvigasezizag.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/78722132291.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109160518195872.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/pinikevemu.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_off0000eaa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 10568 bytes
SHA-256: 7b952e43dc4785ad5b0d9523df8a639c1ce3cdf37ca107b0b9792d21f356f773
font_01_sfnt_off00010279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 17676 bytes
SHA-256: d05365a15ff417cf178033fd610919280901b2c0526dc473cc06d9cbf0a0f95a
font_02_sfnt_off00013085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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