Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64044dc428bb367…

MALICIOUS

PDF

86.0 KB Created: 2021-09-17 15:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d8ad6f9da7fa8f9dd1713ff196aec3f SHA-1: 514ef5369478b5474f7801a025d7b7456f8b1fad SHA-256: c64044dc428bb3675269bde90ccf971d921bde92256fff8f199a42f885631c04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a compromised CMS upload link further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • 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://wastran.ru/uplcv?utm_term=all+call+recorder+apk+free+download PDF link annotation
    • http://geoscan.it/userfiles/files/kenalupo.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/pizagexakinipovubosanutud.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109041055419157.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/53935638259.pdfIn PDF document text
    • http://espwireless.net/uploads/file/87302087776.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/50283857935.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/23909382719.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e94390f97b---7883058810.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/zemilotedawekuwokeragiw.pdfIn PDF document text
    • http://tchid.net/userfiles/file/vegosonexaw.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/xikovowi.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/rolijodetitafaxumev.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/zosise.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/fiwemowagojomoro.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/pesoxebob.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/kexigevorelapazetusuw.pdfIn PDF document text
    • http://belovosushi.ru/files/bemumesaf.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/11815430063.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dujipunaranuv.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408bd336a59---64820385523.pdfIn PDF document text
    • http://lgassociates.in/uploads/luxisaxasapab.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/0cc70ea7317833974c75c5a1d869dd4a/80548462120.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/40219510640.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-7/20210907220011691053.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/51411162009.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/52162523169.pdfIn PDF document text
    • 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_off0000ebd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD2 10412 bytes
SHA-256: aaa3c7e7f3a6de17c031ff731eb11fe94924ed4b099771b9a321b1b8d06388dc
font_01_sfnt_off00010396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10396 17972 bytes
SHA-256: 5c5f6d3f4d325ec5e88b15c11fc425d40c1208583da7490655fe2c77d0f5c2f6
font_02_sfnt_off0001320c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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