Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46513a5dc729d9c…

MALICIOUS

PDF

72.4 KB Created: 2021-09-03 05:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5c2f429ccac9cf42e987cc7ce0112d57 SHA-1: b04afd33bbcb4279171341249f4023704d800466 SHA-256: a46513a5dc729d9cf54cfa9b096bdda20edfa798a737d0b62330ad996082f0b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious links, which are designed to host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://oniceh.ru/uplcv?utm_term=valuation+of+shares+and+bonds+pdf PDF link annotation
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb8329db8b---77002973274.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/9e1ec37e51ccd3a47f9ddfc35003a3c6/82426680459.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/natelijabitomamorafukur.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/55289188986.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/rovas.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/xodujebubimovugape.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/81349052353.pdfIn PDF document text
    • https://bataretak.com/img/files/file/rerenizodudowov.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/nomido.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/migamowovasekinej.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdc8cde0b6---tusad.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608493fd52b6b---diliwekatukazef.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/d9ca51f47808b507a9341aca7fc227cf/nodofusir.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/87575730825.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/puvomilok.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/68109380837.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/gobusitofiruvakotogexu.pdfIn PDF document text
    • http://parfumland.sk/upl/volipugegomidebojabales.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/b2d795a05067f662ace977952e9abd08/namegumigolasuxove.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/6326842677.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/80123206988.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/58631796029.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/fesezozorawabujat.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/mixazalujaforojinuwovut.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/xuvudukejub.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/05dc345282d7700327f25d0db3614c61/42197912827.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_off0000bd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7F 10804 bytes
SHA-256: 5a7408951863aa0be47042c55459d7305e124bc8b29bef8c383801b552419c2b
font_01_sfnt_off0000d613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD613 14832 bytes
SHA-256: 71ce29a5d43c689d86c68f57086f99c8386a42d084df02802da2b418945e6462
font_02_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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