Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53515927fc3625e…

MALICIOUS

PDF

79.0 KB Created: 2021-06-05 15:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: eb0b57f6a1cda76b282860e5006cd26a SHA-1: 556d9783aba491de5cbc37549668229b65fa02e8 SHA-256: f53515927fc3625ed857ea6c59ef630276f82d6688974afd48d3b243dea97776
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of URLs like 'https://krisoc.ru/uplcv?utm_term=download+sportybet+balance+adder+apk+2020' strongly suggests the document is a lure for downloading a fake application.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9335

Heuristics 6

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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=download+sportybet+balance+adder+apk+2020 PDF link annotation
    • https://liderpin.com/calisma2/files/uploads/rafekilarekupus.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/880rbsftf0sia4d8bj6djm7eqf/68244842808.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/51317796466.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/puzenenakafuvip.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160945e4eec8f7---51800193028.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/dabuxuwazolufezumi.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3db94b4d3---libapubuniginen.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/5d6c14105a54627c061a8d8b705b3d13/tovif.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/918ebbb9f1903368985463b4afa35335/remoweduramaj.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bad710be13f---62232486176.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/fixinotogejazumuxogiti.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/34478792860.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/10748011079.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082608e16f3c---dajavufiwuvix.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB69 5736 bytes
SHA-256: b7113363881be8f604df118ed4509a8c4b2fe5b02cc2af19a063938acc9a8b08
font_01_sfnt_off0000ef1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 5112 bytes
SHA-256: 7d865ab5e4b9134decb17d11b1e7353ab27c0ace17ff52e2dc3e02a789fb17b9
font_02_sfnt_off0000fc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC18 11724 bytes
SHA-256: 53de493dc2dbe69d9f5e63d37d3e29f5d90d03a135a0de2d362fb84861bbaa46
font_03_sfnt_off0001248b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248B 16080 bytes
SHA-256: 3cf43d2aa1bc7bf8d16c1c4fdd0fb734b19c39cb762c2b7dd4c7bad761e3df76

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