Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd28addf5abcc8e…

MALICIOUS

PDF

93.3 KB Created: 2021-07-18 00:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b6e1f401c0c1449f4d7c7117c891af76 SHA-1: fb1b6ae66c163fef9d52673c2dc2410daad274ea SHA-256: ddd28addf5abcc8efe42c26efc11ded8b0e919427e08058c3c58ca7019195ca1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 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
  • 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://n-production.com/upload/fckeditor/file/65191806693.pdf In PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/13106631576678db90d20426fa1eb841/pafumo.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/marisutenimigeresugele.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/5309633452.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/12741c62c36bffa724b96eb35c6748c2/17725191658.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/445b0ab5054c63fbfc448d6d42c79974/mopaxojipefo.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/faf9c4f8e2795c9a6b32e99f86cec787/bewugiked.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a07295556---perefakuzi.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/raduvozefofuxi.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c31b5b144---zipasetupuf.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/vikelemusidiwiwotux.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20214292248596371.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/xexezemop.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/dl8147mt84jorhl9q59dkhclo7/42970998516.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1a12a00fe42aae383464ef227f92562d/93928115188.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/82982ea2841ac52b9eb149432b59f0d6/dobiwolamoxewesivimorukek.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbaa8964c2---semalemidapurawitebeko.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160879fe806767---javemolilajabavibuk.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da698255f5---savasiduvopadu.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/7988923531.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/81196691644.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/47290559649.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/n794224crdfq2qj70nd9m9mbi4/33713029463.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f20b6122c03---22993312850.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/gamupaxogosidaxivejobebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=abet+accreditation+policy+and+procedure+manualPDF 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_off00010a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12281 10844 bytes
SHA-256: fffe696502dc61c043d8bc31329e197a4d842950d220910b4422c1eb978176fb
font_02_sfnt_off00013b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B50 16364 bytes
SHA-256: 5d55e4c4e820f49383c9033a21c7142563805832862fc435ae310869a95051f1