Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dfafdadea4433d8…

MALICIOUS

PDF

88.7 KB Created: 2021-09-03 03:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d13948af61cfb468d169e5b1702b601c SHA-1: 977546788394f5ac5a1fa3f6542f609a3845e96f SHA-256: 7dfafdadea4433d853dd4da3551b84917afb32466c8fde3b4989a52d07721414
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. Several heuristics indicate the PDF contains a link farm pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were directly extracted, the nature of the heuristics and the presence of numerous URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://villa-carlshorst.de/sites/default/files/file/suzasusuxefobali.pdf In PDF document text
    • http://harchovyk.com/userfiles/file/lexizuzitawowodoloro.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/21691734810.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/34100972447.pdfIn PDF document text
    • http://apple888.vn/luutru/files/51385517178.pdfIn PDF document text
    • http://ubest.ru/images/file/93290179674.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/xujawitodotobadebuju.pdfIn PDF document text
    • https://ms02bet.com/contents/files/vorovuzifiribimogu.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/9553932173.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/38221354203.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080694d14754---dovimubiwalubawe.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608096254acbc---tomowikivube.pdfIn PDF document text
    • http://blueyee.com/upload/file/130144353561.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/26067974487.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608004cf2ce79---kabapaxoke.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5e14cf3ed1bf7df248219c3ac208f174/39054641829.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/zuwubelurebazizifojar.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/t61t98qgcahjfgn031cfaquav7/sisisimovil.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/makikizav.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bcbe4d2e18---rivutikolunevuduzuwejit.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///povidavaj.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/7764059330.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/16161272798.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/blfcfnh4ddah36mndvg0k0l0oe/kunifosekulewalivirefofe.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///fuwodezegavosifanedene.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/vizitag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=proposal+penelitian+kuantitatif+ekonomi+pdfPDF 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_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 10852 bytes
SHA-256: 21ae3cbeeaf3e38121cc7489d9c2fc9f236459ef4dc9e6fa288a44923f8ea686
font_01_sfnt_off00011050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11050 17288 bytes
SHA-256: 2a2c09d7b648dfe7442dcabf2a71ff25dbd16384810c16d98bf198c604091713
font_02_sfnt_off00013ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1