Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98aebba4e6e2891…

MALICIOUS

PDF

69.7 KB Created: 2021-09-24 15:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1184fc85bcf315a94ec40352f34151be SHA-1: d36e4d5828b2e0c9955ff47ba685a9ee339992a5 SHA-256: b98aebba4e6e28919e04e5f5334fa8fd6c40dfc482a73fad3509306a2eddef40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The embedded URLs and the nature of the heuristics strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=dragon+ball+z+episodes+online+free PDF link annotation
    • http://keralabiblesociety.com/fck_uploads/file/90727982511.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e2890f2a120f4dee4a4016eb8540c4e6/mogiledasibala.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/79405694127.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/jq84nve0mt8ohopb5qep6fbg6n/95008560776.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613967c122a95---wukixefetupuzetos.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/34110307366.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/86683302960.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/powupefanogofetumokufog.pdfIn PDF document text
    • https://clove7.com/userfiles/file/bomoporirofabezasivep.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/46615150121.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/85011907933.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/5d5a2433df22bf11a253c1d237c13acf/44578824430.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/45590183995.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/dagotiv.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2431c233---4020028515.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/46531794333.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/puzilis.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/55551779783.pdfIn PDF document text
    • http://thegioioto.store/upload/files/duxibedibipalibuzafixop.pdfIn PDF document text
    • https://aitalk.vn/upload/files/17209141493.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/nujujogisef.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/78504413429.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/90582737294.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_off0000afb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB6 16252 bytes
SHA-256: 3a8cb4c62424be08fca352444a73520a52ad9d24f243de2992fbb07ee46e7ca0
font_01_sfnt_off0000d928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD928 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 10776 bytes
SHA-256: 2d843ad77a280793de4601726ce55dcc4e7c7458ad2d28b26cd0601e3dcc0167

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