Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b13598ed82ff0ab…

MALICIOUS

PDF

70.2 KB Created: 2021-09-12 00:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 8c23fa3977ca2c0040dcf27202b5d758 SHA-1: 0e6cbffa47d75dd32110ab6f24c88097bd5a81a2 SHA-256: 5b13598ed82ff0ab0004085e56f87e86fc59745bb097ad9a45f026b1b5aa646b
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, suggesting the primary purpose is to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 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.
  • 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://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301e32e3484---sovunikajabiwan.pdf In PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/vsa4etokut3gjjh20aiao8esjb/dutunorudejuwijame.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/7fac6542b00bc5a3813edc056d6175b3/kunuto.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/gapodo.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/92441740202.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/76845696799.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210904053438.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/73022181709.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puvigutipowotovusekoz.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/luzozulajumupizijis.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/21365302896.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/68275748435.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/jewetatawutizipix.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/teraxowisonituw.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/12243328277.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/riluwuligi.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/sugixusoxekanibozowizew.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/2795737635.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/391050291.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/roworujesudesili.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/67652653885.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/87945891528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=kingroot+apk+android+7.0PDF 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_off0000afdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F3 10544 bytes
SHA-256: 51f1a865b770869ce3604f9c9afa110c82b00ff39d9b69a8a9514e37da53499d
font_02_sfnt_off0000dfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDC 17400 bytes
SHA-256: 9a3f1c147bea942af6a315e74546f83bdd766fb0577eb7b1f3db5f0d11238105

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