Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dab9de54cee8a92…

MALICIOUS

PDF

80.6 KB Created: 2021-06-30 16:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 357bc2b4d6021da46a5b4cda748f695b SHA-1: 16e33220b219ae8977392c5c054861f374baa0a8 SHA-256: 8dab9de54cee8a921b9b279583f43257fc329c2ac19d3e3b3080c1b94a375687
196 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack pattern involves directing users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://flardochform.se/userfiles/file/gasajoluzi.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160d402523c37e---xutimidixonorudogox.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d67576567ba---75369350735.pdf
    • https://yenhuy.vn/upload/files/71193288826.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077d9a97a297---80232308920.pdf
    • http://www.medicellbank.com/userfiles/files/lipowuzetoxegidusafisev.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3b8a5d500---40592176095.pdf
    • https://paperland.bg/uploads/file/43893369290.pdf
    • https://taechoclub.com/FileData/ckfinder/files/20210616_4C058AD12D1C43B9.pdf
    • http://arniestribu.com/campannas/file/donafifutolemagovid.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606e290c7b46f---5929602572.pdf
    • http://veribase.com/E/file/32431532080.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/4c9be6ab6bd942f7703d9df9a5e5c48b/9882667462.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/de4rcp3t67osdcn15ufmtoj46m/55328278457.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3aa6b0780---25976459910.pdf
    • http://www.thaiboat.net/image/upload/File/5196222299.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608697d6ccf6b---13703791346.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d343dbb17---zejuxav.pdf
    • https://kisikana.hr/userfiles/file/podewozanasosul.pdf
    • https://lamaisonducoeur.ca/upload/editor/file/nufojekuzivo.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/vaftri92bdq16pkef8fjonv7u5/94607701423.pdf
    • https://dienlanhbachkhoa.info/upload/files/4869065777.pdf
    • https://umartravel.com/files/nejibalotakopesido.pdf
    • http://hydrogears.com/survey/userfiles/files/33565204077.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=introduction+to+environmental+soil+physics+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d654.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD654 16792 bytes
font_01_sfnt_off0000ee6b.bin
75cd6ab37bf7ed14f8a650461ee1d8f1832e1a00e391077f08846f4d44235e5e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6B 11116 bytes
font_02_sfnt_off00010831.bin
a451f31a7e79c2c96895532c19f3ecd68a213824858d51cf5f8f82464be10e03
pdf-font-stream PDF embedded font (sfnt) at offset 0x10831 17380 bytes