Malicious PDF — malware analysis report

Static analysis result for SHA-256 71488d42499a8127…

MALICIOUS

PDF

72.1 KB Created: 2021-09-06 17:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ff9a60299303960ab5a9aedc63898f8 SHA-1: 24e3d217eb745685a96b7f70976b09d059dd2018 SHA-256: 71488d42499a8127e105b0e2b3294df305a57a8d146382354e9e4931233fa3c7
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by multiple heuristics flagging it as a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs are designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's a Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8257

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://chcial.ru/uplcv?utm_term=what+is+informal+communication+pdf PDF link annotation
    • https://djecijagarderoba.me/userfiles/file/93048099110.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/gei1qp7kkgjj3k877q14l7lv2o/47535136079.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/43979795672.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c01d152dcb5---70298360316.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/dumedadel.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/bomoriwalidodivevod.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610334e7b3e75---85972448736.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/91712526084.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/u9vbidjjcanefq6o2f56q2k7pm/4873776301.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077c71773154---kinojesujukijez.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c3bcd56ab---66422995039.pdfIn PDF document text
    • http://herbexindia.com/ckfinder/userfiles/files/mizutosunuz.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7eed859eebbb2133e68368ed1466a93c/nabomonalitoredomuxinimuf.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/2455347603.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ee02f1d384f---4405095301.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/50430220691.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/gusodakomeredasosux.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ek0bpvnctd216o3dih9pa9fd7o/27982506417.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/73681636925.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8e61ed298---90727280187.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/obvido2man4uaccr9llj8a77q5/jububikiwuduxusurowod.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2012c9182---kemejuxubijijumur.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/77163568671.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/ladabopepixid.pdfIn PDF document text
    • 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_off0000d684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE96 16236 bytes
SHA-256: 8df990df9a23bde7e494ed800d3d0bbb5f9aba9dd5a45289b457940b3e238149