Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c40e3c8dbb63c8…

MALICIOUS

PDF

55.0 KB Created: 2021-07-08 04:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 63706a19c1736e6946f674275fdd3f7f SHA-1: 310d04dc67d3718adf7101116d1564d0251cb88e SHA-256: 87c40e3c8dbb63c8951626f67bc928edf30de6f12b083c77c799c20934d00c69
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV and ML classifiers. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress installations. The embedded URLs suggest an attempt to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5455

Heuristics 5

  • 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.
  • 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://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16070631980eff---silare.pdf In PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/fcum375ocmaabb7n5qoi6la455/87314534769.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883775d956e---nugigelezafefoz.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e99f15aef---nofetimesonezin.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b59abf91424---rorivibenemov.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/83984644186.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ad6ceae41---60549744644.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/70728191680.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8urb219hjgam5rnn876pc325oo/wakazuvabukaxuwox.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/xijazefisip.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/51176757303.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c909303abe4---76705651649.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/pugitog.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16070684d2f056---tajoji.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/o74h49debfa9ggumgg79q89ri6/66455038644.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/50b61a2e0bc0dc0aa49a855f7468db81/43437892815.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/922a274ad48208549940ba1c4dc1cb67/99787802963.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9910ac262---tajudufabepukasemoju.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/mepuferitefadoxetafode.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/e675f72109e1bdbb39df6013fbc1a229/zokudomoxeporure.pdfIn PDF document text
    • https://turbooto.vn/upload/files/fojowanabaxevunenegew.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/38646709756.pdfIn PDF document text
    • https://service-panev.com/userfiles/1938466492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=download+an+email+as+pdfPDF link annotation

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