Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da2782dad10f674…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 20:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dbd2d5c922b7d177eab9e94066a2b427 SHA-1: d3638ad147de933dfbcf2be2bb5b5e37d877c45f SHA-256: 5da2782dad10f67479d51c88115b52e68c0bf24c37c50f5b7618017bd3210253
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a malicious application via the provided links. The embedded JavaScript is likely responsible for redirecting users to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=takatak+app+download+apk PDF link annotation
    • http://premiercontractinginc.com/files/file/kiwafenozozagibizukar.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090823163143.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/82884719578.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210906_055102_9695.pdfIn PDF document text
    • https://campermagazine.tv/public/file/53516787611.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/notodeligerog.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/32984035803.pdfIn PDF document text
    • https://krossi.ru/images/content/files/7036900905.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/42137391223.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/rodonagonusolimumiw.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/iqvp8101h7jq3ij7jebpdo1inv/99491770685.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/35090687294.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/f0482c528656d4cee196c3a3f5e4cdf4/48622934893.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/numowewosujega.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/93604091801.pdfIn PDF document text
    • http://poorclarescork.ie/images/bovelirenuruzojevepusi.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/45111649743.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/24587253843.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/mapedu.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161413f11c2e67---78375720451.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd4a2307d2---subovimabuk.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/tagipaxiluratid.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/63159724988.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/87346162342.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_off0000d6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C0 10036 bytes
SHA-256: c60f2894f40d093b3d30e6b5fe80c4894be31d499083a527a0c6cbec78aa257b
font_01_sfnt_off0000ed3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001054c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054C 17352 bytes
SHA-256: 028db2b8262e97991f7abb2f586db9382bcebf33e54e7ee1c83dcbf20f985615

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