Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a643fa8228a6815…

MALICIOUS

PDF

85.8 KB Created: 2021-09-11 21:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc1c3ab3e37f5a459778806cfaa1fef8 SHA-1: c07d3285d7210a68e3affcedec7b2654f931cabb SHA-256: 7a643fa8228a681554a3ca1a4421d44ec836d49b3d11524a9b180a9ca2f1e3a6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised WordPress sites or disposable domains. These links likely lead to phishing or malware download pages. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.2214

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 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://synerhu.ru/uplcv?utm_term=note+7+custom+rom
    • https://birsamundapark.in/userfiles/files/texuwigeketa.pdf
    • https://heuresromantiques.com/upload/files/77072026211.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613546f2b6bdc---20425669881.pdf
    • https://luxesystem.site/js/ckfinder/userfiles/files/vusafegapixugup.pdf
    • https://aep-tc.com/cache/fck_files/file/binujim.pdf
    • https://stalbeckers.nl/userfiles/image/file/9586044838.pdf
    • http://www.vandiestbrandstoffen.be/uploads/files/wibakezemen.pdf
    • https://clubslotalmatriche.com/calcas/file/toginuzuromat.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/f918938f84adf93228bc6fd61e906213/fusosem.pdf
    • http://global-leasing-management.com/uf/file/jogegimupijat.pdf
    • https://wonkingchina.com/d/files/61020643739.pdf
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/sikukefulusevodaduwazasu.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/76ef83586551627ca22e74821ed7be7e/jijorap.pdf
    • http://laureysnv.be/uploads/files/45017638795.pdf
    • http://naim.naparts.com/images/fck/file/13183232525.pdf
    • http://homelife-superstars.com/image/files/4844315699.pdf
    • http://www.ondebiz.com/userfiles/file/xidiropedavumelepu.pdf
    • http://niezapominajkowo.eu/userfiles/file/38923960312.pdf
    • https://www.luxboss.com/ckfinder/userfiles/files/32386126325.pdf
    • http://grandfiltr.com/files/file/budojofo.pdf
    • https://haysalon.com/public_html/userfiles/file/tizife.pdf
    • http://drumlockingclamp.com/FCK_Editor_Images/files/ralujizeni.pdf
    • http://starroadchina.com/userfiles/file/34506424437.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613983ebb8243---28792185137.pdf
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34919525066.pdf
    • 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_off0000f498.bin
e1c54ad8664bd53c8948320931dde00ae7d1c4705e843a4e311a4a071ef40840		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 19412 bytes
font_01_sfnt_off000127ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127CA 16792 bytes
font_02_sfnt_off00013fe1.bin
00fa7e3f03b52ecc6e68c0ddf802621b198e5badb0fc90268c2fda2584bd7b64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE1 10116 bytes

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