Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af7cd08511c6168…

MALICIOUS

PDF

74.8 KB Created: 2021-09-18 14:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aedae357ee674ac9b905805f9856f17d SHA-1: 983d3be0cf17bc67f646f02126014e18c2166282 SHA-256: 0af7cd08511c61688e90e2cbedb5d3e630efe8184782dcd52cbe267225b150ba
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains a 'browser extension / update installation lure' heuristic, indicating it likely attempts to trick the user into installing malicious software. The document also contains numerous links to external PDF files hosted on various domains, some of which are identified as compromised CMS uploads or disposable hosting, suggesting a link farm used to distribute further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://kuryakyn.ru/userfiles/file/visinenubifiwetaxu.pdf In PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090108453561477.pdfIn PDF document text
    • http://elma1.ru/!upload/files/59010478967.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/11739735922.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138969a78c05---19313054267.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/barimililegerisex.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/zegawiraw.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210915152730049.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/14096357217.pdfIn PDF document text
    • https://agregadoschucuri.sinecsas.com/ckfinder/userfiles/files/jokokazudovikevafixopetum.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8dc244392---silofapazobumaki.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/dupodasobegunolib.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392b53a8bb5---tudugadox.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///vijadizivoxib.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/91629556907.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210908221136687.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/fuxuvununoziwiwewigil.pdfIn PDF document text
    • http://rhondachem.com/d/files/80953462629.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/gibowigegodanotamonamape.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16310828242008635255.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/tonatowojoj.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/xutimuwoxudilubamoz.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/5615140114.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/fazogovoripixibesofixiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=view+cookies+in+chrome+developer+toolsPDF 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_off0000c0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EC 10828 bytes
SHA-256: f8559e89fff66185df3aa6fa7702a6f6cf76a14fb1e2d541c33b078fec7e63c6
font_01_sfnt_off0000d9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C9 16924 bytes
SHA-256: a9bf37f48716ca2be8ea3909eeaa85d3953ef9b8f2203e47665992c76945604f
font_02_sfnt_off000105ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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