Malicious PDF — malware analysis report

Static analysis result for SHA-256 3adf04b8df2692f3…

MALICIOUS

PDF

63.7 KB Created: 2021-09-08 07:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 93558ac8d882be80377944249277bd2d SHA-1: 00fde3bd2f6c667ba777925cfe8b1da66a540b1f SHA-256: 3adf04b8df2692f3ea9a96882db5bc987a38b9e9926f541acbc1ec3e2241130f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised websites, indicating an attempt to redirect users to malicious content. The PDF structure and embedded links suggest it's part of a link farm designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8532

Heuristics 5

  • 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.
  • 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://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/uovj27nsneo0e544jdif2t7am4/7402071162.pdf In PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b275f5a258---jezajiwulamulore.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/pimelig.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/tinilorudude.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/letaxipexebetozizilugav.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5219ea90eb---91722889701.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/41343404770.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/sevasir.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105300503217840.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/du3m6ras23u9k8ofhhqp6854a1/lebomikulomaxijok.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/wevupulim.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/munojusibebax.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021072812180673499.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/xaxoxapu.pdfIn PDF document text
    • http://twilaw.com/files/files/mapalivoxama.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/zolimixurewiragokikomasis.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a274b2ba933---45411655552.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210905040537831754.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/zetobuxikoli.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160be3631813a9---9764040352.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/31109075119.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/95959978963.pdfIn PDF document text
    • http://planbmedia.hufiles/fifamewulewo.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/wawanasusepadibem.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7196729004---zusoxabena.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609863cb2fad6---81752647999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=mbt+orthodontics+book+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD568 10604 bytes
SHA-256: 8d36690b397bdb2e598c339f625fc41c6e7f98898fe36ad033cbfaf41e37ea47

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