Malicious PDF — malware analysis report

Static analysis result for SHA-256 36673c85cedb0577…

MALICIOUS

PDF

81.8 KB Created: 2021-07-19 05:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0caf6973f47f9983606b3cf5bdf20c90 SHA-1: 2fc80e191e2f85fbdc9b06e7a377eeb7a5d5c10e SHA-256: 36673c85cedb0577be1cc48b28f498ccb0b621d63c38248b8dd876348e2e00f9
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The heuristics indicate the PDF acts as a link farm, directing users to multiple compromised WordPress sites and disposable hosting, likely to host further malicious content or phishing pages. The embedded JavaScript is the primary mechanism for initiating the malicious redirection.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

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.
  • 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
  • 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://islandpointfl.com/userimages/98266650717.pdf In PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/14fac9a38619f4cf5df7cc57710d24ff/26312260942.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/nipipukepunijajonada.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8ca35cb98---tuxopufojuvi.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/43812406304.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082584b7ada1---3476777625.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/20134242807.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3p1l8tn5r1vs43i4ihssnc4u4a/92276713012.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983d9fcc1d2---rowijodutigoxigi.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/85c47665d7ea89e2eb0a9c9a9ad2fac6/minuvimonapideripiged.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cf3a8b6e6---dudaruxubinexanidazu.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/dolujosudile.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/63248564107.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/f51f52595f2cd0e30fc7a9048ff551ae/62794246748.pdfIn PDF document text
    • https://wagaskar.com/media/suwitoninune.pdfIn PDF document text
    • http://klassn.com/ckfinder/userfiles/files/31060419495.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/53622534524.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/1db68f9064616253633d57bd37280d63/rupenurebepesoxogutarop.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/f1475877ca3c86d34009fbf0740f1583/naxikegozoguzusevepezuz.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/38144193039.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/69152690795.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/70518482111.pdfIn PDF document text
    • http://dchs80.com/clients/c/cb/cbc185099defa3274d3d4f74835fd64f/File/1869517837.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/53156092068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=all+multiples+of+24PDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/fa8727de32d1508028d3008f44d88ea4/50515227765.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D4 18824 bytes
SHA-256: ab68a2b89d9c5c123df4fdcb229ea3d399dafc39f287903c8328c039c8e75873