Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a43396ac854c51a…

MALICIOUS

PDF

82.9 KB Created: 2021-10-05 04:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e4e2be86798a9453da8b67e092a2d2f4 SHA-1: 6bdb000a27674f4a0ca8e500f3bfa9bd85e6d829 SHA-256: 5a43396ac854c51a1ebd3b7b0e25c064ab2576593082631e372a8fc30e6daa85
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of these links and the PDF structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=chicago+manual+title+page PDF link annotation
    • http://mextro.de/upload/files/25743584707.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/12776918616.pdfIn PDF document text
    • https://paysecure.ro/ckfinder/userfiles/files/59981623917.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/2109041521028775003e2ye.pdfIn PDF document text
    • http://neuroxl.com/images/file/61846330706.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/fibazunax.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/94178294183.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/derunexobitukema.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/gofeseferazas.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359f6f8414d---damigaditeg.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/62832608527.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1beb531f2---44302943724.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/dubulabezepimawope.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/mexepux.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gageraperape.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/59639659555.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/jezedasonarizus.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/riberefew.pdfIn PDF document text
    • http://quranday.org/userfiles/file/90960642698.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/boxesuv.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159fa47f1909---pabilonu.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/kuroregapojosetu.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413f365e0dc---34206561711.pdfIn PDF document text
    • http://wamer.org/userfiles/file/buregapiluwamiv.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/25/bazenegeruji.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_off0000db85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB85 19640 bytes
SHA-256: e30f12f5743ec780a239094dd086e2f75b67a78ab17ceb6867215d0fd094e087
font_01_sfnt_off00010e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E11 10684 bytes
SHA-256: feb8d5898ccc43220e660fd5c932390480437624a5e6f51c59df482728dd8fec
font_02_sfnt_off0001266c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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