Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1825ff8bcc76767…

MALICIOUS

PDF

54.6 KB Created: 2021-09-12 13:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 317bebaa5d280027f466dd0cb951b5ec SHA-1: e60439e9f44510a6b753a6a0b98ad5b1c3acb951 SHA-256: f1825ff8bcc76767001ef1741e5ad5a17df30e880c7bffcd6b5095650d5671f0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting it's part of a phishing or malware distribution chain. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8091

Heuristics 5

  • 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
  • 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://krisoc.ru/uplcv?utm_term=space+pinball+android PDF link annotation
    • https://dreamscapes.ca/dream_scapes/userfiles/files/67201549587.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/30996731666.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/gevokexoriwugadaton.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613347a4c2dc4---3132390732.pdfIn PDF document text
    • http://mamam.by/upload/File/file/36052298373.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/80536195336.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/sonanutoxosenafavada.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/nrg57hdk7j32jqrde6u24e1m75/wamanixubele.pdfIn PDF document text
    • http://szcftz.com/upload/xinidi.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613182ae5ca31---wizav.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/19226359073.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/47361738974.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133c273285e6---sogokixatugegimagotifes.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/87446048549.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/9568931914.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/tuxidow.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/44772268145.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/5526919075.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///59381108946.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/kosolumobekotevof.pdfIn PDF document text
    • http://hydrem.ru/images/file/dogapite.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/padukugipufitorurugej.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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