Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bfcd5637eda88e…

MALICIOUS

PDF

41.5 KB Created: 2021-09-25 16:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c4de8b47b7696d29e4303a3e5e3f7cd0 SHA-1: 51544c5219e01206eb73d73bf20d7a0b511dfe96 SHA-256: 90bfcd5637eda88e6c42ea1fd2dff3900b3c85969117ed80700db88fadc60b9f
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a phishing lure, employing an image-only facade with a hidden clickable link to redirect users to a malicious URL. The embedded JavaScript and numerous links to potentially compromised or disposable hosting sites indicate an attempt to download further malicious content or redirect users to phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7092

Heuristics 8

  • 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 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 41 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://pixomot.ru/uplcv?utm_term=super+vpn+hack PDF link annotation
    • http://huzatfokozo.hu/editor_up/bepejikinuperureremorido.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/sasugigejubu.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/27847061505.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/papuvibofojijef.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f74a76b42d---23998195442.pdfIn PDF document text
    • http://slsnn.ru/content/files/fajezuzomubag.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/zoxumilo.pdfIn PDF document text
    • http://halanmilk.com/upload/files/padexobi.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/walemazawo.pdfIn PDF document text
    • http://indemo.pl/Image/files/matojonegamamanutoxawu.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614c4f751becd---biluz.pdfIn PDF document text
    • http://hmed.vn/upload/files/gojijuxovojubajeg.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/10617788914.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/92673094196.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/31763153606.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e2d7b4a6f051cde5524d2c19bb593ae9/jizep.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e635421a77---kosiwazemekekuf.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfc5d84bbd---rupazaxizaderet.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/pupakoraduwewozazuzo.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/fuzulirozinilelosodar.pdfIn PDF document text
    • http://lex.tj/img/file/45784952017.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/jemetutijogadotuzubus.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/86495046333.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/53172797421.pdfIn PDF document text
    • https://qematalsihha.com/ckfinder/userfiles/files/3780237221.pdfIn PDF document text

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