Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1ed228ccfba513…

MALICIOUS

PDF

71.3 KB Created: 2021-07-29 20:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f8ba156174c78b52b661b95b58eb85ac SHA-1: 59d086debbdee6fb11c39d229433141ee7a8ffdb SHA-256: 1b1ed228ccfba513724a252fd0fd49ac4b341ee866d3977a7898bcde4044f79c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to serve as a phishing lure or a downloader for further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8295

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.
  • 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
  • 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://synerhu.ru/uplcv?utm_term=pet+mods+for+minecraft+pe PDF link annotation
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865dc72b6c0---70014523653.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/jometebabugo.pdfIn PDF document text
    • https://lysgaards.com/ckfinder/userfiles/files/16840509964.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cbb2ef740---85645851168.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb418dbd84c---xefokuvorojujeni.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/99023069813.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811fb56207c---mawonenajunetunawopew.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/66536c5247395a968064ffd6d4d4de25/85777934483.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/694352208d108062ac4dc703a8cfaabd/kabojelogajokera.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbec278f1a---mopizovoj.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/zirosapuvemifutawam.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/85829953.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/siferug.pdfIn PDF document text
    • http://jarosi.hu/files/file/besafazivutatibexiziburi.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/wetajumukaxiv.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086d49d8cf55---mowefazewadojapu.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607856a611c65---nukikeruxovotogorelelidim.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609980e4111f9---fetedufesuzafazurubedimur.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/makigewaralevikapigexanif.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d5e8c1f4f179fc675f59fec86bbd0953/kuzunapogumegu.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/tuvoguxutoxamitu.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/butedalozabewipuxodef.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/65010170465.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 10736 bytes
SHA-256: 0be18f1d87bc84964134c36c760415cba776527c294d641f1577be49a9b87515