Malicious PDF — malware analysis report

Static analysis result for SHA-256 28be92d8770600fe…

MALICIOUS

PDF

84.8 KB Created: 2021-08-24 23:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e1d0f7c4281bc079bb138dd2667410f8 SHA-1: 6f3771f8d7a92774e99c26841f23f2b9fc47516a SHA-256: 28be92d8770600fe5c837c9adbe70e5d96fb9e8007b89aac8cfc2a9dfc8abc3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links and link farm heuristics indicates an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://inwebjor.ru/uplcv?utm_term=reconciling+a+bank+statement+worksheet PDF link annotation
    • https://kawanmto.net/contents//files/zefifuf.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/104u814km63rrbq3f4oeqg3jqf/gejane.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/89605281196.pdfIn PDF document text
    • https://actorconseil.com/files/file/welurinurad.pdfIn PDF document text
    • http://goref.ru/files/file/83923647487.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/42e2cc3038d3b864db624fc52205f10d/33799641660.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/21898673792.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/87266888082.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/61296107799.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a17431e95a89f2f2ad0be3d780b2aaf6/potepilaludu.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e99251f91---41124777013.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdff58675f---duwarefelipututukedotow.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4f8c25cc9---kuwadefupaxan.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210503195715.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/delulivotewusotowimedawe.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/jmm90ffkqdq0m4upa6vsl5b9gc/83993010445.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102eb30b8cb0---73350582198.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/wipimefegog.pdfIn PDF document text
    • https://wagaskar.com/media/70722848634.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/12086609390.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/23992117270.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/4cddde655e29e9a9b28db06716636a4f/86732092785.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/betadu.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/9tgshr5qubti9agjhtl38kg7kj/46279383514.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_off0000e591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE591 16692 bytes
SHA-256: adb6f6e05ea9df198b04fb986d8916664f0df9ff861131675e227d8164cd1b5f
font_01_sfnt_off0001112d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12944 11040 bytes
SHA-256: 9fbb2615ebd4feea2edd536ce2c1d39b1205b0fe821ba99ff74f71bbaeb2dfd1

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