Malicious PDF — malware analysis report

Static analysis result for SHA-256 30d8a5c12bb9bac8…

MALICIOUS

PDF

82.9 KB Created: 2021-06-28 02:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1b33310de97790efbca0bd585814247 SHA-1: e71f6925aebc4c5d665800a35a8c216595dbc855 SHA-256: 30d8a5c12bb9bac863cd509c87ef886db852ef4f876e6ebfaebc1dae9ea6e728
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. Heuristics indicate a link farm on disposable hosting and compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://bulk-supplies.com/userfiles/file/waximoneragubovozivu.pdf
    • http://elitvorota.ru/f/file/4439689237.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ji7ifq2btr0torj8e83l71uhu7/55702472859.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16216883221249.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/cd7038415c693897905e4dfb04c112dd/71073203383.pdf
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/71841816997.pdf
    • https://houstoncoinshow.org/FCKeditor/file/tumetexibabenomuluvepago.pdf
    • https://beautyyaurient.com/editor_upload/file/28559871160.pdf
    • https://tepihtrava.rs//files/jalifotopunubek.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2bf06f06be8981c3ce05672838465707/28542008798.pdf
    • http://narnivet.com/userfiles/files/vawibirisedimuduvul.pdf
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/lulukejoxaluwifaporojekev.pdf
    • http://biancoacolori.it/userfiles/files/49516035205.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3fb64f183---misuzatokutazexit.pdf
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/70a35c11f9ee05ccfabc3a08600273fe/79313714413.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607feba34ed08---2980101613.pdf
    • http://berallebags.com/UploadFiles/FCKeditor/20210514192843.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f83e99197---wozokisukazago.pdf
    • http://www.radiooro.com.mx/media/images/uploads/files/tevudapivatili.pdf
    • https://acryl-bg.com/userfiles/file/piwifujaga.pdf
    • https://anaksemut.com/contents//files/28218408680.pdf
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/o9mbidq37j2dnd1fb7hqiujfj4/15898975501.pdf
    • https://roomart.uz/ckfinder/userfiles/files/jimuberibajonerosi.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/2saskqrr4h2girligaguts1mt2/98777781195.pdf
    • http://georgekoldun.com/var/upload/file/61703551131.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+are+the+lyrics+to+the+muffin+man
    • 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_off0000e068.bin
69183395e6eb1bfeb5cff3776551a2e15575c555d05f52a3233cebc48357f1bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE068 10808 bytes
font_01_sfnt_off0000f934.bin
3beafe46a57c1c0a3be42c75dffd86a5ed5c26bd5a8b5f68ec15930e5cf59a94
pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 17336 bytes
font_02_sfnt_off0001262a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1262A 16792 bytes