Malicious PDF — malware analysis report

Static analysis result for SHA-256 145094bb605c482c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 01:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9eda2e58e2d6b98cb81240547fc3f2f9 SHA-1: b2b17a99f95c8b0b2dabd33c56c266b7b2be41ea SHA-256: 145094bb605c482c20b3f85fd9c4d204cf5cb7696a40f307ba2c92139bf19c56
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links pointing to potentially compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ahrestygz.com/userfiles/files/20210911_202253.pdf In PDF document text
    • http://fluitec.fr/ressource/site-image/files/38503183501.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/45537919679.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/xenonuxu.pdfIn PDF document text
    • http://3asoft.vn/img/files/57187414023.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391f331d332---8329967022.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/dewoluburedologawumiro.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/78852589640.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/zowaxikeni.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/gereribo.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/lujavanorijuvufepina.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/juzojoditekiverufufovi.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/4056f92e595d96a880d68e70f8b2b81f/58997444665.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/7306312647.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/pdql9h42mqkfn8v4lqqt9as141/21209412775.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/22990548073.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/96811885770.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/93016882401.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/navazitonakow.pdfIn PDF document text
    • https://31app.com/userfiles/file/33747648192.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/14207029196.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/70756455634.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313d67bcb52---75717934774.pdfIn PDF document text
    • http://e-sheremet.com/img/78675708892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=screen+mirroring+z+pro+apkPDF 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_off0000e038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE038 10632 bytes
SHA-256: 0c8500ec0570c1834bab0e3fa29b4f83348f2f35f377a6387fb4c39f8b2c2970
font_01_sfnt_off0000f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 17888 bytes
SHA-256: 1ed360d9dc3701b0b76bba27c9691a00d6e8a41ff72373e88981901d4470a910
font_02_sfnt_off0001270c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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