Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd0addf3cf9344e…

MALICIOUS

PDF

84.0 KB Created: 2021-08-18 21:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1a8053dda8594f4f7a400e78265303c8 SHA-1: e4e0f36dbd0f754e8bf49a09519fad6747671f26 SHA-256: ecd0addf3cf9344e2164abec345fd271ae3d60b6133c453d5d9633294a957fb8
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The PDF also features a large number of external URIs, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm designed to distribute malware or host phishing content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://chia4kids.ru/ckfinder/userfiles/files/48327202463.pdf In PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f55bbe744e5c7c19599bde572da87258/vezofi.pdfIn PDF document text
    • http://htcable.cn/d/files/nefukitufukepidotogusij.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/xigepijar.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/54365075067.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607051bf54f64---zamoluvuduf.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7874764804.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/lasiledopomof.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/33094892115.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/majurotakitawezumi.pdfPDF link annotation
    • http://zezoalza.com/ckupload/files/rugoworazudag.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/45f35a2bbd7385d1f00d0c67af751e0b/bogel.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40998655698.pdfIn PDF document text
    • https://langumeistras.lt/i/File/50824206583.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/kenodovebuxijevazexexufut.pdfIn PDF document text
    • https://retta-bg.com/userfiles/34492006578.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/siruso.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8vjg6n6u4dm36j9tk5b0gscake/tulalafimazaridoramifaj.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/70749751752.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/gipoduju.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20216231828205737.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16077155b53f3f---ronulegunumu.pdfIn PDF document text
    • http://jfe.hk/userfiles/votujurofez.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/c9139f48803ff4fc3f5bad0ffdb83e1a/deguk.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/ragileduru.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/96901840135.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/ribupozadipav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=download+preset+lightroom+android+xmp+gratisPDF 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_off0000ddc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC9 11028 bytes
SHA-256: a10f776f6912543cae6fddbd524476f3af94aaef20eec29d50c1af16625868c8
font_01_sfnt_off0000f71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2D 18564 bytes
SHA-256: 6cb32995df68f008e5c9304a5a0c76454a770dc2a2c0a7455b80613542b72593

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