Malicious PDF — malware analysis report

Static analysis result for SHA-256 290ec85404951480…

MALICIOUS

PDF

77.6 KB Created: 2021-09-22 23:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 512d610d025b10b99ecc726dfbfc0df9 SHA-1: 904c8c486a4498a1c35174d545c488f5aedda4f9 SHA-256: 290ec854049514803883447e89451353a33e45fe18b71469f74a21a282b559f8
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3684

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://algarestofos.pnh.pt/js/ckfinder/userfiles/files/wukifopideziker.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613099e8d627f---gidogorebukibonifu.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f688c5d7---nanigolikumasomofejiximo.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/zizoliwegupura.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/sororuvaviruzu.pdfIn PDF document text
    • http://penzion.sarmo.cz/Images/file/mirivesovadagenejibevikab.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/17911760241.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/4800622668.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/sizivaf.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/80619055924.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/27452396699.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/munadefijixuwix.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/88413855253.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/pagopupabo.pdfIn PDF document text
    • https://uhcp.com/editor_upload/file/1760791111.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/4igs190n1fnj5n2o7blva4809e/medizaxixokosubu.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/podosovirodavav.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138dacb232b9---mazilurimumexun.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/48868007389.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613264e497284---97189101624.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130387be2339---zilesebimixotetuguxowa.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/mewedefekeve.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/maxewag.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145b8c8a9e36---47412162660.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/74945630739.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15408753475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=domain+and+range+of+inverse+trig+functionsPDF 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_off0000de0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 19152 bytes
SHA-256: 5866337c394b7f40c532bf2d7cec4b478ab3eaca04fd9afdd6605dac666defd4
font_01_sfnt_off0001100f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100F 10940 bytes
SHA-256: d9da20481f7b70be4974b8c5b5d337192103096e612adc7e72c5664eb35347fb