Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed7a3917a55a4f5…

MALICIOUS

PDF

70.7 KB Created: 2021-09-02 02:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 279feba7c57f5b0f72655df5373feec7 SHA-1: d1b919d93f81dde650f960f653e32cf48be438d4 SHA-256: aed7a3917a55a4f5e4dab5ab7c4f8bd26bc4eb9c6fd6c37bae779b7cd41f8265
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6507

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://blbr365.com/userfiles/file/1623941867.pdf In PDF document text
    • http://aelma.com/sites/default/userfiles/file/ditipoxijarelivag.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210728151106313924x287r9.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d657ecb4b8f---vawigoxefotegukomupif.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/wowadedajuduminotakebuf.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/monimubiwonida.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/rixajasogoto.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/0826c0f481a68eb6bd3d427d15a676d6/xoxeketafirumeliparafa.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/jopagabarudu.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16108ba448c6b0---zoninukadera.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a73b459732f---gapekunegoridi.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/lipubolorowu.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/0fab90e5ce48ca90797a801c53685981/49439795673.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/2d128ca9cd6875d475efce913f4892e0/12393486270.pdfIn PDF document text
    • https://datawire.gr/files/files/62700427890.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12ad19722f---47952160418.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f862a77af5---13117918610.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/23846997436.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/limirenenuxolunafakune.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c46404f529e35b4adce0698bbaa14d85/giruzaxo.pdfIn PDF document text
    • http://jar-ted.pl/file/87925562882.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bbdbdda3f0---71686547092.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/62241567743.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854970d6d2c---mabolarum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mitochondrial+ribosomes+55sPDF 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_off0000d1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E3 17824 bytes
SHA-256: 781cdc1976dca3bbb50a85ac6383091994ec2c351021a06ced288525333f3a45
font_01_sfnt_off000100ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AE 10904 bytes
SHA-256: 49527cdc6a4619c8620114b5f8b93b91969224ccf04f5a2f1ea7abca057a4741