Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb79177efed1dfad…

MALICIOUS

PDF

87.6 KB Created: 2021-08-31 00:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 026aef7cc09df40b0854b6d8c4bf2b9c SHA-1: f9d396a51af45937b91b8a925d994dde72555b16 SHA-256: eb79177efed1dfadb7697c54c4737e2aaaa363516e3b70af2e2f6fe20590f57c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable domains, suggesting an attempt to distribute phishing content or further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nbnjl.com/userfiles/files/69140469829.pdf In PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/sukudosimovutug.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/17ef4ca8dcde32fd85a2fafe94629769/kademotofitovuxa.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/12920046908.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/25ca7943dfb55ba2d9b645f982c6fbc2/pawetiju.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/phskugd1dqic1c4c0phi667r5l/54210313704.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609075138ae1f---vikerisapadoxetenilan.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/aiat925icfvr4fb8jbb0slbsg8/mewibuze.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/zikodulotunadedunekowuf.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160818fd6c7029---53647211446.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/hlmtiikrjaho2er3t3na34m0nc/56179070889.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fb617c4d4---47103833222.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/26568432992.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/zopaseroputaxaf.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/31255658265.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/68489550706.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/jofaruguwoxibaxemavejewu.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c7dd3a301---pazunikumegegixe.pdfIn PDF document text
    • http://ropesadventure.com/d/files/gikolofurujilefame.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/27986939651.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a943a1dc7a7---vupusajik.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/sagidez.pdfIn PDF document text
    • http://carszana.com/image/upload/File/79391398569.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/bonupizegebujiwusimoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ielts+fever+reading+7+answersPDF 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_off0000ee38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001064f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064F 10560 bytes
SHA-256: d2024d59f72887ba336ae2ac19448191a398db028d5f8f42521d6ab7b3185c02
font_02_sfnt_off00011e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E66 19284 bytes
SHA-256: 2d2218eedf29f1fbe5787090965abc3c86cdc55377053bd18e979b2037a5345b

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