Malicious PDF — malware analysis report

Static analysis result for SHA-256 b209c076a08b2b8f…

MALICIOUS

PDF

70.2 KB Created: 2021-09-05 20:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 189767d902a29b39b1cee5d80394c3d9 SHA-1: fe8df91d9514347bcc2725c504597bbf3db1cf0c SHA-256: b209c076a08b2b8f9d2b2affc013303978cc4ca6d05faf23783bc060bf1cc137
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were directly extracted, the nature of the URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8295

Heuristics 5

  • 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
  • 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://krisoc.ru/uplcv?utm_term=saint+augustine+of+hippo+pdf PDF link annotation
    • http://supermarketdv.ru/files/file/fuxovofanuguzaforideb.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3bdaf048d---savaleja.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/86786371383.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/rorakogulibuvapifibuz.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/gonorokirefamubomi.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ed4372417---82431913384.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adce9cf2172---fatesunenixu.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/43889685863.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202108291311024535.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0396e5f247c99bdf95f2b1b9a4a95bdf/pefesidi.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/51021362974.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03f18ea35d---badonotej.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/76688060893.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/butef.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/66524438641.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/38940243364.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/33136785187.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/23645508528.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/54830351799.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/35544012951.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ccd91dc88---42902994946.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/pgjtueis3vrf7f131ok51ekgk1/sovezevujoxovufonut.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ga2fvu4624t3nuv5uielf312j1/zelugitemig.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE455 10808 bytes
SHA-256: 1e0e3961a0d6d7f3cbeda1e61540ba82ef823af3a7393cfd3a6d4f34669d2973

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