Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ae0ca49edebc772…

MALICIOUS

PDF

86.0 KB Created: 2021-08-03 10:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1da734b647f265dc808ab18d6c0e0be8 SHA-1: 5ce4137ebd3667ca61b6cf0b6f135bcf58269a60 SHA-256: 2ae0ca49edebc772a52e67bb7a1e00acedc68aa6a240a3c23fb4611c18a4f364
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript could be used to further obfuscate the malicious redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8422

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.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c3402cb2b---dutiralopoxuw.pdf In PDF document text
    • http://xutricolor.com/uploadfile/files/bonevogemebitemoruranap.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/77cf0aed2c21aacc7022a57c334efa5d/5646099900.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/41f81587ae76a6863d1ff81fe4bace0f/48172075192.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b867d32ee78---99914241945.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/93150569097.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160815f4533c40---12773348615.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/fijutuzugabuzuzilejerom.pdfIn PDF document text
    • http://wenxuezj.com/images/File/bupuri.pdfIn PDF document text
    • https://fond.ru/userfiles/file/4397180089.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/0d4a5d263c535ea1ba5042978b851338/3962795962.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/56677986165.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/87280748843.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/56015883723.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/16904834279.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073536b43091---9993473350.pdfIn PDF document text
    • http://vnplastic.net/upload/files/25625803463.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/383jopgo3iho77o1snbohp6553/pejaxizo.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/wonepuwafuvegigexivepo.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/zegikaxel.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/mobetolufowujonopot.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/u53situltcnpi2dhi41ke0bjlg/bikijunefagozigufififagu.pdfIn PDF document text
    • http://industrialdevices.in/uploads/dumakalomipugin.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e3262d3cc---zeniwagatowutifef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=offline+action+games+for+android+apkpurePDF 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_off0001013d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013D 16828 bytes
SHA-256: ed96128cbd826b8999bbd35c775d36032a593c31774098b40abf246cb0f84e3a
font_01_sfnt_off00012cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC8 11180 bytes
SHA-256: 66ddf0edf782e93a6528d05a25fab136f5d8e5752987d414b29bf8860d18aad1