Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c5e15e7d22aae9…

MALICIOUS

PDF

83.5 KB Created: 2021-09-06 05:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 19032ad7960cf9137572e41fe1c97551 SHA-1: 88627e3397a0dafb7a5bdcd823b7423b3a7c76d2 SHA-256: e5c5e15e7d22aae90e2b42749a7cf5212ea2a5f1725bda5d11eee7115bac2ba9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which are hosted on disposable domains or compromised WordPress installations, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://amuseonline.com/absite/userfiles/file/vusikisajazibaxorewe.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b816e3f946---xasuzamizevik.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/50404512092.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/82170226073.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/85057187524.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/57660564727.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cfebeebdb---5166086611.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/dusaf.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/th0vcl4ta7rh482lh9jibkc1d9/mipajevusaweb.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/f145fd3b8d4c854ca4b0ca1a64f31d1b/11454737315.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/28869867326.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/97302935522.pdfIn PDF document text
    • http://charivne.info/images/file/62249484720.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ad90359a6---regowudivorerux.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/tupuwivoweva.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612775ca335b2---65869921539.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/66755157271.pdfIn PDF document text
    • http://land89.com/ckupload/files/wumiwugezituzidored.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/f8fb0e15e8882a8d9dbfceb932f9bddf/gabavut.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088df344f4c6---keguziloruvudopanojulux.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/saxinusexiwajitakejeferos.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/votafifupumewuxakis.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/solusaturuligigupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mitsubishi+triton+2018+specs+pdfPDF 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_off0000def3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 17952 bytes
SHA-256: fbde4af77ddc338a85f28b84a6c015aaf08c171431222819adb79af8eafe8129
font_01_sfnt_off00010dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC1 11244 bytes
SHA-256: eb2a4e8789194eb209e6bc1e7ff307a143c76f9f151f985d190b9c15c5dd6647
font_02_sfnt_off000127ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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