Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6381bce358b1f57…

MALICIOUS

PDF

79.6 KB Created: 2021-09-11 08:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6cd7e208306ed225d5fb7b7019a1c8fb SHA-1: 0101ecafe98c93b3a3a07cb6ef29ae3105478365 SHA-256: f6381bce358b1f5786e35181a91034840658149dac9ffebede49d4785b0ccb6b
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress sites, indicating an attempt to host and distribute further malicious content. ClamAV detection as Pdf.Phishing.Trojan further supports a malicious classification. The presence of a link farm on disposable hosting suggests a tactic to obscure the ultimate destination or payload.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

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 http://modra-skola.cz/userfiles/file/630528181.pdf In PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/ae03a870fa4846222e2661a56e99bcf0/veridugasut.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/99273446481.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/wolivadisotugi.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/tilozeg.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/wazovosexumugamaxatebedon.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/bukexu.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/xulabupikujelareker.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/36083226020.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/tidusirolesu.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/lesibat.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/nuvikeped.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/hhv9kkhrtrfff8aoa2re3qirai/61571863796.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/896078656.pdfIn PDF document text
    • http://suranareecommand.net/UserFiles/File/jarolanatajerededu.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/23585050088.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/mawifipogibawa.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210902_223DA8F8850DC6A2.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/lubasakuworo.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/tubewexijarajugapuporab.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/048f071a5570b030ff6edb3ebd1f0166/puxof.pdfIn PDF document text
    • http://vladekoservis.ru/files/66509301849.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130067fe73e3---14448884.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/fafijesa.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90107619163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=waptrick+android+appsPDF link annotation
    • 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_off0000e735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE735 18264 bytes
SHA-256: cb062ed6809c2ae5cde540e453b3452b591cdcc802b6863cf55152ff9a2ea387
font_01_sfnt_off0001164a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164A 10416 bytes
SHA-256: a7ee83578c1771fb09566508e46f0aa5ec962fb83c0b82581c069eebdcb6686f

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