Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b0e8bf5f09785e…

MALICIOUS

PDF

75.6 KB Created: 2021-09-16 13:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fa04dac763252513c36923a84238124 SHA-1: 41320cb8a0d7d6233f5a71f9cf86c30a7c30917a SHA-256: c1b0e8bf5f09785ebe4f2240f5621e20beac42c6147f1523e91a3b04ad8a6238
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous links pointing to various domains, many of which appear to be disposable or compromised. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a link farm designed to distribute malicious files. The embedded JavaScript likely facilitates the download or execution of a secondary payload, as indicated by the 'PDF_JS' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crocepadrekolbe.it/userfiles/files/tukukene.pdf
    • https://projektovanje.info/userfiles/file/nemikufojifotapijilo.pdf
    • http://dogable.de/userfiles/file/82216795945.pdf
    • https://pakianco.ir/data/image/uploads/news/files/todepi.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4oeilnnincnpk5ks9aihihuedc/kojavajazavakixota.pdf
    • https://terminarz.online/kosmetyczka/krakow/files/58282748719.pdf
    • http://bladensburg.abwingsmd.com/uploads/files/1243100971.pdf
    • http://studiotecnicomartani.eu/userfiles/files/roraginemosanebavopad.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdca9934f6---lubowok.pdf
    • https://chsins.tw/uploads/files/202109031949489953.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/lbla7sfvutdlkd7rvehoimr8t7/diwukarikadokuzadavagobol.pdf
    • https://gmnavarra.es/ckeditor/files/29801559046.pdf
    • https://x-leather.com/radsportfiles/file/zawefokikaj.pdf
    • http://twfindia.in/userfiles/files/xemorazatasunadiniloti.pdf
    • http://mibenjamin.com/userfiles/file/foburosupumodeza.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/tukofefiluzuz.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/8k0933edarjoemc8jgcdksd51u/wafimuvofevukesiwadux.pdf
    • http://kahasat.cz/data/file/falonewavotunazesoxe.pdf
    • http://creatinglifeoptions.com/userfiles/files/joridedepatup.pdf
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/punefudenigoruvijijujuzu.pdf
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/61337678081.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/79384575640.pdf
    • http://www.gamylai.vn/uploads/files/43588200389.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=animal+farm+online+text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c668.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC668 16792 bytes
font_01_sfnt_off0000de7a.bin
1fef211ffb6fd06069f7079f56526827a90203bdadc6bc9cf1c84ab984bd6d80
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 17004 bytes
font_02_sfnt_off00010a72.bin
f8be72a2e1aaaa22d8cbdeaafe8628bbf147d5d56e3fdfdd9cdd5f700d83bbc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A72 10292 bytes