Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd468bcbd5cecbec…

MALICIOUS

PDF

82.5 KB Created: 2021-09-10 03:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 1704f0e6e7c2df8810604562d4f73457 SHA-1: a5945996179634f8c286b6c760359273b8ac6961 SHA-256: fd468bcbd5cecbec9791a6dfb6ba6f16be07fb85f9b358bee8f0ec877a31fedf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/3ab95f7e681a99338a367cd267b1d82a/pemavinabavelinodoruma.pdf In PDF document text
    • http://rafaelstore.ru/upload/files/tisuluxitevotegidobeg.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/gasisuz.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/jepubi.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/fujojapidekujuvif.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/19843579516.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/27372988849.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/lirumafetexuf.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/3719796852.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/levovadag.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/0bc6cd397c6f68e773a2497f4859ba7d/rigisik.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613576d5b9250---745595435.pdfIn PDF document text
    • http://czminghe.com/upload/files/10851901626.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/muzovegazuxoguzaxozisaxo.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/27136233956.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/sijalegowolalamumi.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/xojowime.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/78551799160.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/wapetob.pdfIn PDF document text
    • http://chinazzjx.com/d/files/65797924956.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/30c92ab289d976e640300e268453df5d/71341564212.pdfIn PDF document text
    • http://glassick.com/userfiles/file/83625996447.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/vuvodajavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=backup+and+restore+sms+messages+androidPDF 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_off0000d8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F7 11056 bytes
SHA-256: 9766926332f2eda52b45f930dc8b26ec4032e5866510a5fc20b52733ccd8042c
font_01_sfnt_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 19384 bytes
SHA-256: b6597b02a8ad632b0049bafe1cfca2cd6d1f95b54ac5834c293f265bba933949
font_02_sfnt_off000123e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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