Malicious PDF — malware analysis report

Static analysis result for SHA-256 056223e5c56c9924…

MALICIOUS

PDF

76.5 KB Created: 2021-09-15 11:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7b80ebb26766e80f6653402c9fd8ff3d SHA-1: c7035837bbb686a24f667262a851bf00b0a059c3 SHA-256: 056223e5c56c9924eb72c2087562f58fa0aa35789eeeb349e036ef654a4ec986
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of link farms hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://irlanc.ru/uplcv?utm_term=android+studio+sqlite+database+tutorial+pdf PDF link annotation
    • https://mimpiindah1.com/contents/files/kizuzewezimamimaxel.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/8095353314.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/ziwawipavizavibazefokil.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/18032956807.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/78933270429.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/78433631148.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/e8f0b0f3a9817ed84331f492f7e9d724/82288323542.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/83758192477.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3f3b614159527df3bfd12b577c647108/fumubaw.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/visulusalujiwokop.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2eb6ce5f6edc7b47ab605b664b96c7a6/58613697862.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377d4954bd9---91659761354.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/xejibivagarufugegura.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/delezopujisomumoxoxo.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/55816674470.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/73009717835.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109100001246658.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/wunulepozenenajubuvuraz.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/wusevemavavofidafepiwuso.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/81225011265.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/90820914398.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_off0000c5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C1 17640 bytes
SHA-256: 7b970e4398c069f09ce67e202193eacdbcb7e463528795302efd371ff223e9a2
font_01_sfnt_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE7 10860 bytes
SHA-256: dbad1d9c015f124b1fe21124fdd3f0113307ede1c3846c1cd0dfaed591dc425f

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