Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff25a2ffa1f4bdf…

MALICIOUS

PDF

80.4 KB Created: 2021-10-12 02:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bfd30fb9ff1ad3acbb0cd50f01863499 SHA-1: 59462e313bbd2dc98e14d327dc4e33352d170484 SHA-256: 3ff25a2ffa1f4bdfa967cee5552044577ab3787d8ed078df0f825c811f175dda
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristics indicate that the PDF acts as a link farm, pointing to compromised CMS upload storage and disposable hosting, likely to host further malicious content or phishing pages. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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
  • 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://www.igescanada.com/ckfinder/userfiles/files/54520630120.pdf In PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/6407128586.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210910100835_1547859841.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021100506552599.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/xidibofajapanawa.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337961b5727---12317408862.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/gidexenuxemuwuxabixaju.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff142ee8f0---renefu.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/614890547.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/34304217290.pdfIn PDF document text
    • https://hot-pol.com/images/file/24481525341.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/44549437635.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/97339294829.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/tabafujesusi.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/jetakemoso.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/82308126723.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161542a11f387e---nidelufopazerirexaxepaduf.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/28991444243.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/retanuwatigarije.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/nagatelipurufa.pdfIn PDF document text
    • http://creationart.hu/files/file/fejufixowuparika.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/buzikafilisuxexoxegugejif.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/66369219994.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/TSvcnjQ06Jg/uplcv?utm_term=wipro+accounts+interview+questions+and+answersPDF link annotation
    • 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_off0000d7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A6 16776 bytes
SHA-256: 81ee722a25ee58c95281b4a0e3f463cd2399ffd0ae1c7eb91c84a9cb834082ec
font_01_sfnt_off000102c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C9 10852 bytes
SHA-256: 5aa13b5cba5f9d2398325fcf292d12af8d984b75265cc98f1f324c161da4f8a9
font_02_sfnt_off00011bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1