Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e281c11c7707d5…

MALICIOUS

PDF

72.1 KB Created: 2021-09-26 06:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0bae53bddea51b46728ad2ceb2200f3a SHA-1: fd0c34ff439aa8d3d1f2eaf35994bda82d20296d SHA-256: 64e281c11c7707d52d0feae3b7c4957d03f0ca1ead2c4744ed351945fc31cccd
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting the user to one of the listed malicious URLs, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=mmd+maker+download
    • http://dabaizhongxue.com/upload_fck/file/2021-9-8/20210908110209957386.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b79b07e554---bumasavoxurozusu.pdf
    • http://ingfrimale.com/userfiles/files/95673305341.pdf
    • https://divanich96.ru/admin/ckfinder/userfiles/files/72105320695.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161431d5365068---suligadedakudobotudesox.pdf
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/36827263507.pdf
    • https://mangalargalux.com.br/ckfinder/userfiles/files/98272909970.pdf
    • http://storemisr.com/uploads/files/77787944749.pdf
    • https://fullprotec.com/ckfinder/userfiles/files/23829827399.pdf
    • http://hockjoohin.com/admin/uploads/file/39962549911.pdf
    • https://doan295doson.vn/namthuan/images/news/files/59078185499.pdf
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/vozezigidevikivat.pdf
    • http://handgun.ee/media/file/8414683937.pdf
    • http://webantikvarium.eu/tmp/47823020691.pdf
    • http://smirna.pl/files/file/sarixivodowedotuluki.pdf
    • https://rinducm1.com/contents/files/25695472947.pdf
    • http://gat-asset.com/CKEdit/upload/files/25401751282.pdf
    • https://rajatotogroup2.com/contents/files/biketomanes.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/48hdhp3rlbq7h6hopaooqaaaad/26614759697.pdf
    • http://tischlerei-schlusche.de/sites/default/files/file/lolotakevomopikizuj.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161395f557c8e3---44363294377.pdf
    • https://propiedades.net/ckfinder/userfiles/files/37209990154.pdf
    • http://ohappy.org/userData/board/file/13348375071.pdf
    • https://stehovani-ostrava.cz/static_pages_files/file/9193919727.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/pimimexumebedosawediti.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b66b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB66B 16792 bytes
font_01_sfnt_off0000ce7d.bin
e73f2d21eac79b428774719e8419d13f13d6f74bef529f0ea8e0a56722ae660c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7D 18024 bytes
font_02_sfnt_off0000fc64.bin
a520d73182b88c2842b13ec9bbbd204520088555cf6f461d6b805b98df0d8463
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC64 10220 bytes