Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb38c066bce0c828…

MALICIOUS

PDF

84.6 KB Created: 2021-06-29 05:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: def42e0affcf6ee359e665001525780c SHA-1: 06422162b853cd9303cc957a682fa1d6c8a328d6 SHA-256: bb38c066bce0c82820940b6c9cd36a17e206bf6f859b6f341fc466e5467d39a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The `utm_term` parameter in one URL indicates a potential phishing lure related to educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb1a1ef024---xaxararafizorenum.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/940a0062b48eff85468386dcf224d197/jewoxawarewaxi.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b797e3fbe3d8b2b44d988ab300625203/39420734506.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/782a6fda153df773c1cdd3a56063c08c/kefelafip.pdf
    • https://ajitcoatings.com/uploads/86602937125.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d472b312a8.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab84d26fc94---sixufovit.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/fj7si3nk7k4ofj5aas0dim5ol2/21725168065.pdf
    • https://hirurgija.me//files/wonexomipodagokakowudirib.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979a28d60d6---57626468696.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/025c0b2db62cd7026547eb866ef12230/dosotavelavamazuvinamaxid.pdf
    • http://izeninfo.net/admin/upload/files/81205550201.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16092ba701d056---58193897168.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ojn4ll46kjedef8n38v4k81str/nudogesoleve.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/636bc7c94fee3ef1cf45c01f406d72a4/3518206448.pdf
    • http://vswet.ru/f/92714375623.pdf
    • http://chothuethietbi.info/img/files/33386375795.pdf
    • http://etnorom.hu/pictures/67212270341.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/881d0d097dedd407da97ca7d2b69c98e/17636631506.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3350cc421---69621107301.pdf
    • http://worthingtonpark101.com/userimages/gosarosezovixuzevux.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1cdqqvm6uk16ohs777sm2c501/59208221071.pdf
    • http://alkanboya.com/files/file///60137978301.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=3rd+grade+addition+word+problems
    • 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_off0000e691.bin
f22562c212be7ab6bac56b1e145949915c91705f60fdbad98ed94de19b620b4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 17332 bytes
font_01_sfnt_off000113b8.bin
cf398c777c0bbb5f40b2d04b9dcbb673f754b7f406996c400716462ae0c0bdcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x113B8 11036 bytes
font_02_sfnt_off00012cf9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF9 16792 bytes