Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb0374a0e1beb33…

MALICIOUS

PDF

79.5 KB Created: 2021-09-19 17:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 90901fba475449da9585a183ee373ca5 SHA-1: 80b3ef41b3f60a15374a21415054a83c1b18f7b0 SHA-256: 0cb0374a0e1beb3326715868bc011789dd1888eb2b15407575fb807b43268d3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection or further malicious actions, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://kancelaria-perfect.pl/app/webroot/media/files/295115734.pdf In PDF document text
    • https://bayihoki99.com/contents/files/60342855315.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/supone.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/46516178824.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/lumivabamiwadasezudokipu.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/dedatitijufuzufobodeleg.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/jirija.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/wonamamufumogazofowa.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/67205646076.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/44504809133.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/tawoxeranudipeji.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/99903767288.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jamudijodebef.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/suzudefubutasu.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146852b14a79---25603514518.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/bc9bd8157ad8507bdf3678224113ec48/57832027119.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/13296003407.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/49586591312.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/82788100831.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/mofofu.pdfIn PDF document text
    • http://storemisr.com/uploads/files/9131505179.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/tidexixunupofuwavajowup.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e400eb7ae8---30841718916.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/93042654897.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/48346302897.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130dc0ede045---43413308273.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021916721552521.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/siludojabir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=prodigy+marie+lu+pdfPDF 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_off0000d133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD133 17908 bytes
SHA-256: 51320468e889c7125d8ba0e2e529207ef81e16ee4b25a062161226df6763a7f5
font_01_sfnt_off0000ffa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA4 10688 bytes
SHA-256: fbfdc5ec27fd155be7442993201cee403583aeae50dc81256234575c490c6d61
font_02_sfnt_off000117ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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