Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7d2b162a6d44fd…

MALICIOUS

PDF

106.8 KB Created: 2021-07-05 12:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7f4a36da412a1b22b18193815c50de57 SHA-1: 2b14beed9c5d46355ebc4132e24fe27fcf612b2e SHA-256: 3f7d2b162a6d44fd34efb51bc0e32eae2250d367a966d8ac5f55fa049c523a4c
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also functions as a link farm, directing users to multiple compromised WordPress sites. The ClamAV detection confirms its malicious nature, identifying it as Pdf.Phishing.Trojan. The embedded JavaScript likely facilitates the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3314

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 https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083b082785e8---raribanidikev.pdf In PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738f3fbffa2---vodinudedomasureguvuka.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a5589d493---51328492916.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d5d070c9a---xifuwojiwunuforaz.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88783035638.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608303be4de6c---sujubonajefewasagepig.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdb496a48c---fiduxaxame.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/13950821914.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/30666443.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcf8d5917a---15897256347.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962678b8caf---67248144763.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/56904646093.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/88626553919.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/jopiwanetavejexubuxifeno.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cecb90234---87841690769.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/32096459189.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/vapuzuzogapodajogel.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b8f4f54a995e30c6ed4331079b1cc02d/99931298979.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/bibewipez.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/59119cdd8bb79e9fa9faf9d9dbe192f2/xisoseveteduj.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/122fea658a4b0f2661d5f0ce84dd35c4/50981772523.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/c96b22abb306303797de6699d8feac60/63514530922.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6a207ba26---zamelut.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ff7e086d18b2d47262bcc9a1a271b14/laxuninesexobetatibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+banking+method+of+educationPDF link annotation
    • 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_off000160a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160A8 18340 bytes
SHA-256: 68a890b9777974a677a1a5e0628065e9c5b3ef2c1f4098a726ae5bf0eff2a2dd
font_01_sfnt_off00018fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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