Malicious PDF — malware analysis report

Static analysis result for SHA-256 843c9380e4bda483…

MALICIOUS

PDF

42.5 KB Created: 2021-09-24 11:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cca138aaf78d823ac626067b7a28c002 SHA-1: 5866ca6970f42f781616e02c15a97fc5034a56be SHA-256: 843c9380e4bda48307b5a47bf99203e640f915e87ac5cc8091e4bd1edcc9a057
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URLs, many hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users into clicking links that download further payloads or lead to credential harvesting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7814

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 42 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://philabc.ru/uplcv?utm_term=element+with+smallest+atomic+radius PDF link annotation
    • http://odnoklassniki-files.ru/images/uploads/files/tadazajunonavelaxof.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/47315526983.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161460aa03b2ad---77988159571.pdfIn PDF document text
    • https://ka-base.no/images_students/files/mekisavi.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/66648979399.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/1371893492.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/50533169916.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/qshcthnqjilhfohufgk0bu5ji8/29700402406.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091101424891.pdfIn PDF document text
    • https://spacio.hk/attachment/file/24148441060.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/zuvijugonirozuk.pdfIn PDF document text
    • http://novichiha.ru/pic/file/36008736560.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6209006536.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/nivavisusadixisuxasemu.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/94868709073.pdfIn PDF document text
    • http://youil.org/userData/board/file/41107510515.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/18945214738.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329dc966462---11502748007.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/45224219435.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/58247068595.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/gazozufe.pdfIn PDF document text
    • https://posh.hr/files/tibujemelawax.pdfIn PDF document text

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