Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da5f5e24cb962e2…

MALICIOUS

PDF

76.4 KB Created: 2021-08-30 04:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d45262a33abf16e2df88be5e19a1cefe SHA-1: 284c17751c03cbb57f07a607805cd15357eb10bd SHA-256: 7da5f5e24cb962e2bf27bd485ab35d0ca7cde7cffb468c209601b6f21b7fdda8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://huntic.ru/uplcv?utm_term=poems+with+figurative+language+highlighted PDF link annotation
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161286b14b7712---10755934408.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/finipotubomu.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/38242759527.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/xifodufunagufin.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/muselexabilozixox.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/6df9382f844bac30c716a2011d95de93/pumojusefuwit.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/98561351452.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/83333628814.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/juwupixo.pdfIn PDF document text
    • http://semot.com/Store/userfiles/file/48600156846.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/turomujoroposaxewow.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///20441999070.pdfIn PDF document text
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/70862802591.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/sesimuwutuve.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/41409851284.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/meruvedidemuwuvoxe.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/fazawadekapono.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c667eae01---76556118256.pdfIn PDF document text
    • http://mdtrend.hu/files/file/sijozakokegadifoxosokisa.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c221dc181---79748681525.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608856278b6f7---wubudopomure.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/lt2gn9qobpktesrn3dg8rq2g3k/vupixiz.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc7a1e9f74---71277087629.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/matotam.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/36158216202.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/duhh5qopdggk32f8f1hi8s9uvt/33187259924.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/75557056018.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_off0000c6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BF 11056 bytes
SHA-256: 80f8cbd4d3695301ffcda263e1efc739be5ee51e5499e139d384ccb8588a9a18
font_01_sfnt_off0000e031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE031 16764 bytes
SHA-256: 44c697a909d7482005225a758a7311d200b1323c157ecb84cbafd231e1dcb7e7
font_02_sfnt_off00010a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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