Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb98b116aef5656…

MALICIOUS

PDF

83.5 KB Created: 2021-08-17 00:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e809b40ee42b0297c11ac5b637d73cd8 SHA-1: adff02363c0cb6fc6d44e1a4e32f702e88425598 SHA-256: 1fb98b116aef5656264d5629b951ef6c4a8e61cbec38036026cbcdbc7d69aa47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. The presence of 'utm_term' parameters suggests an attempt to track user engagement, common in phishing or scam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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 https://chcial.ru/uplcv?utm_term=hat+afrikaans+dictionary+free+download PDF link annotation
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/oum7lrbiq6jdqir9ilbcgkct8i/78757092474.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/9e3c26b05d5a7b511ca8bfaf8cd7cd38/rogunelinuruduma.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/9fjtoa3ppe5u4mhr5lqe5rinib/lodakepewaxobo.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ad5dc896567c3a5892ab878cac77f988/31641477592.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/tifip.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab3cf8815e---jolatumodewuripuj.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160999d213166f---fazubotekegididasapine.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/af49fd355c763ab0afc83b97978060a5/1128798024.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/dbd9b830af0256a9b97a312dc19af0cb/7612360739.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rucd23055rfvarajvonshocvk5/vexatufusixigeloziveluf.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/gudovi.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/93218706599.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/68657163303.pdfIn PDF document text
    • http://614move.com/clients/4890/File/kafavemupaxetitomujeni.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9022436b98---54560223059.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1033d4e803d37560030596d0125ad778/11635588470.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/66354419888.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/35761032988.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4d7cac03fbce41a6cfadd2de274b850b/zubokenufoluziserafivuva.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/63911735979.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609495aaee00c---kebevitobisideva.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/ju65k8bmggs8ps46k3t7fo8jvn/69710914616.pdfIn PDF document text
    • 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_off0000dda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 10752 bytes
SHA-256: 157e2331649a8ca9c69ba8f4fb3b22981b2c62f13b989b16f05abad5afd94ea1
font_02_sfnt_off00010e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9B 20532 bytes
SHA-256: 6bfebd741cedbeded93736b358b75a2bb416c63d87da2b840c22f3340bc12680

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