Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1627697633be4f…

MALICIOUS

PDF

97.3 KB Created: 2021-09-04 22:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2523f85efdebbcee3638fa08882ae6da SHA-1: 8bbfbf9abd4e48188fc237af0cece2cfa3dadd01 SHA-256: ce1627697633be4f6372ac757e5b0f1c019c4171887dbb389d53f585f284e56b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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=vegetables+and+fruits+list+pdf PDF link annotation
    • http://acecaalcoy.com/userfiles/file/89584094977.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160badc23a6b32---revoranomiwodesisirade.pdfIn PDF document text
    • http://ramsteinroyals.com/clients/e/e6/e68fa2bc61b75b8a06766e25905052c7/File/gepikufironewudo.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b50a4ae736---ferigekamute.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/37522226010.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076f57c95350---14822932908.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/gejegagivozujesatakob.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/40470619339.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/zagixeberedaxilagakinivig.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/lisotimaxojisupesuzasewuf.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160fa7c0f5165f---21408541470.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/nikikelavel.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/mapinetujuzatetum.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/mazazid.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d39e061b10---31064001365.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/33896554338.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16120ba995383f---mazowejamifanetariwe.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847cd3b0109---81845303123.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/pebogowagomimizuro.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/721bfa1a9eb28ba85304e03bccc48de7/nixiwe.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/46c356e641ba7741ca2757ab61e8eca6/94012851640.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/67473131912.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/43196595763.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/2efa8d2812174b8c35ebe95d1a2b1f30/47253818439.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/um1ovbhmt691hcoi5jhsan5umg/26365953133.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a92e8cc79---lisizinanejesodepolije.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_off000118bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BC 10760 bytes
SHA-256: 82b2bf874154c5977145cc6f1c335dd2ca8d4a09058fb4c3b56676686cc63ab1
font_01_sfnt_off0001312b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312B 17852 bytes
SHA-256: e7d9e67aefc65d70e466669b69384ae95712afbf75c00ea911d96294e5885b49
font_02_sfnt_off00015f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1