Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c371fde1833c666…

MALICIOUS

PDF

68.4 KB Created: 2021-09-26 07:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 820af709b2f20fb58a72b903276008af SHA-1: 0a53a5c9da66de59d80eace4e1d3378034695cb6 SHA-256: 8c371fde1833c666833a0fe78ab14e71a3083372a3f6dd56d7894fcaa925acda
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://aumnat2car.com/ckfinder/core/connector/php/upload/files/68321784856.pdf In PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/10781457768.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/vavadi.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/wifavofoxotozoziwajetawo.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/80410384873.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/2b40e444055ce08a17cf2d0cceeee7e8/vekofod.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/81379393111.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/82531878938.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/26127755837.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/32289488997.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/13706359695.pdfIn PDF document text
    • https://yifff.se/userfiles/file/pekoguvutefugoxivizexaju.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/48701387093.pdfIn PDF document text
    • http://szjg.hu/images/file/493287858.pdfIn PDF document text
    • http://3q1p.com/upload/file/210908113313837626wsa9ngujnr1y.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/kapelixifamow.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/27218262991.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/44862921016.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd187e257c---zesetixibebopigivakizaxun.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/9736620760.pdfIn PDF document text
    • http://termocity.by/pics/files/natogotag.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/54617122901.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/1516595716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+create+back+button+in+androidPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afc10513aa---sagok.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_off0000aed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F0 10560 bytes
SHA-256: 9aa85137e9a56a1d5d496c624bea199edc4da89cdd5535928f7d9a3d1e926a82
font_02_sfnt_off0000df1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1C 14652 bytes
SHA-256: 6ada7e97c305cd9d6b58dfc0d76e440f9f9b16be013d8d98fbaee11386c6e951

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