Malicious PDF — malware analysis report

Static analysis result for SHA-256 b483e726753d0d30…

MALICIOUS

PDF

114.0 KB Created: 2021-09-23 15:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e17c3a4a410a938fe64e0b13c4dd0264 SHA-1: 80831cf5a624b854d93533e546ae1ee768910ab9 SHA-256: b483e726753d0d3075e12a6589b2ff073f7a1bb2e2831101c3d25c54de6982f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=thematic+analysis+by+braun+and+clarke PDF link annotation
    • http://nasfthr.com/userfiles/file/bisarozirikixedaf.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/lolasiraxorosojor.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/tafagomujokogal.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/79584516730.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/52890663148.pdfIn PDF document text
    • http://efrex.cz/files/file/65499617767.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/sajesagadunol.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210923030601.pdfIn PDF document text
    • http://rld-carbon.com/file/89139539414.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/53852020882.pdfIn PDF document text
    • https://senfina.top/uploads/files/20564886563.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/55243425213.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613331d54bd86---38595078475.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161410d796649f---54503795905.pdfIn PDF document text
    • http://laduses.nl/image/file/61139576932.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149396c52974---lagibojajedorarit.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/xenikux.pdfIn PDF document text
    • http://creationart.hu/files/file/75379366798.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161462dcb68f4c---95294616763.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/zofuzunev.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/wugukijixepagapifideniw.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210914_124827.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/tezefaderipij.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/49376839678.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_off000158bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158BF 18744 bytes
SHA-256: 4398fe79aca01c0ab3eeda25fff815f718ebe6b2022d42ed178e29458a3d378d
font_01_sfnt_off000188de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0F5 10924 bytes
SHA-256: 8390ef964d4b16ded6220706ae2ed5ccd4378fc890b297aa970abb6068203f91

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