Malicious PDF — malware analysis report

Static analysis result for SHA-256 8367c947ab807cb8…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 00:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e680cc31a1cf0e58ba057ab55dec1d62 SHA-1: a609a46ffd19af4e5296a9118585ad6e179435a1 SHA-256: 8367c947ab807cb8db4ef74e4e9be3d55f5ec12d28d5ea78f442c4d3fbae8e3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan payload. It contains an embedded JavaScript stream and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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://noclegsosnowiec.pl/eurostyl/photos/file/wowaraj.pdf In PDF document text
    • http://ecohort.com/userfiles/files/38600301704.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614505a32e2b2---11102553465.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/pigexurugoxol.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/64237814735.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/gabojulometinezumuxegata.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/daxujavag.pdfIn PDF document text
    • http://gabortech.com/admin/file/83475068930.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/79456871717.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/9be7f018ffae9af27d921b9713e1ce0e/vawegedaki.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/retewug.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/80837009259.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/35948658062.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/52268337909.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/gikugitaleke.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/zibibiwomox.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/rovojuf.pdfIn PDF document text
    • https://tele-video.ru/upload/files/nedatur.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecd691f0fd---21624002126.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/tuxoxadiga.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/sepumodagobekesezefibisu.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/wagagidavenukikijiboluf.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210907192552.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/tafuzaxeradozizipoxuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+use+allcast+on+firestickPDF 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_off0000db86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39D 10596 bytes
SHA-256: 86c7ad85c84ca39b634b9c9acecb6e9843ade0289d28c92ba685b357c9b7d362
font_02_sfnt_off00010bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFC 17820 bytes
SHA-256: 2003e51385756a0e25a5df87edddf9fc7c4f5271f8b831028346014dd2f8111e

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