Malicious PDF — malware analysis report

Static analysis result for SHA-256 441bc334e55a11d1…

MALICIOUS

PDF

87.2 KB Created: 2021-09-15 06:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5cea8c5a51b5e1e240771b91ff3b4456 SHA-1: 814c03288958d5dd1711c4d81ae6b4922d1400ed SHA-256: 441bc334e55a11d14b7a3732429457398566b76f866bfc3ed9116adc1e445f4e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded JavaScript stream, while not directly analyzed for its payload, further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613573d187357---tosogakal.pdf In PDF document text
    • http://nmways.com/uploads/fckupload/file/lubizorodiduzeduwefozu.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb8e9d12b---27513468234.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/045bce951fea981b1f05a0cf7c36ad04/2289908403.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/16734400334.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/pefomefatovitekekaguvoris.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/41372962613.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/44760128670.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/weridewejamavimirusowol.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ef53de14f2fe1b516d142a40c7622367/jivodakolixup.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/e5v3ca1ga1ml5npnmuhrluoskt/rujuzopisuzudepe.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/29517992249.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/90945048162.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/gewuru.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/81057690039.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/jogariduxuwa.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/xizizi.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1bf69ceb9---vijurejipanavobojizijapif.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/70465850633.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c94c48b860---98505723419.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/dogus.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/76102095483.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6ca7329334d48032a8e20d2e8a974aa1/54445842999.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/24733494159.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/18960530544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=tv+tonight+brisbane+free+to+airPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE3 20232 bytes
SHA-256: eb843d8ddbc03c597e1069ce10a54554ff41b0bd77966ae6f7f8d0552394eccb
font_01_sfnt_off00011e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AA 10616 bytes
SHA-256: c05224fabf3d04e98550cd941fea836a919fee11ba356a50971a428c9a43925d

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