Malicious PDF — malware analysis report

Static analysis result for SHA-256 f619d651cff5b39f…

MALICIOUS

PDF

69.7 KB Created: 2021-09-19 06:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e98856b2c5d016f71706bd7efac2c06 SHA-1: 6a209f4f6937ae4c16c459db194fcf041c55c6fb SHA-256: f619d651cff5b39f339f29452929ee82dec499a1665990a1d7bcdaa979a7be94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a link farm pointing to multiple disposable hosting domains. The heuristics indicate it's a phishing attempt and potentially a Trojan, with ClamAV confirming maliciousness. The embedded JavaScript likely facilitates the redirection or download of a second-stage payload, contributing to the overall phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14986779999.pdf In PDF document text
    • http://koyomisushi.com/uploads/files/fefidowisaniguwumedobito.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/72954043753.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/3928089024.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/70216014159.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/lunisamulabawopupa.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/gunamup.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/ruzivit.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/xawaxokewopelugut.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/minulozetizarodo.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145d5db6fe7a---zidipesifuxubofuben.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/woxulazovonetivegogejegu.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/43915604932.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/7305478496.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161313f8d97019---soxonorefukasowirutoli.pdfIn PDF document text
    • http://kbfrutos.sk/images/_file/kokafobazokivatesapazinuz.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/vitijun.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a7f049175---48923612770.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/27801909016.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8ea0c058b---41400500425.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd641c7687---xonukaxet.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/xekijuxawokipado.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/96313194934.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/wiralojibetij.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/23c2866572f19fa75dde92c76308eff8/58327228341.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/jeferorukirozeloxigupiwew.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/tijiwiduwafeguk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=daydream+android+6PDF 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_off0000b493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAA 10380 bytes
SHA-256: d0bf8fc1244ec9e3a55063c75b8a006b56ded7a14a006eb814d477d8cbf506c2
font_02_sfnt_off0000e416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE416 15132 bytes
SHA-256: 6d9c51bbd2a854ceab1da84c12975c58fb067de2cfc5610d9af439ef10f1cdb4

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