Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49f87bb9641beef…

MALICIOUS

PDF

109.4 KB Created: 2021-09-08 11:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: efe1298e0a48ecbf3c14e2195ed110db SHA-1: 99d775435f33e82a3d2183cb46aa79f1053f1f98 SHA-256: d49f87bb9641beefe1caa6357c9139012a7284a05889e3df54a269d5f8b27f87
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or trojan delivery mechanism. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites. The embedded URLs suggest an attempt to redirect users to malicious content, potentially for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8039

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5be760faf3---97165192197.pdf In PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/96679915676.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/91869660417.pdfIn PDF document text
    • http://apsons.eu/files/file/22911196364.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/75931296821.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/23847185370.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/wufuwujerovufifigovob.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/39388383990.pdfIn PDF document text
    • http://cycling-software.com/files/file/gegagi.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613248a450d18---dalaxovafawibililenet.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/2c6dec5d8230bbfd37822001572e5ad2/pudofafumubusajaz.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/677oo9tr2oaqudg1k2q4ji25j2/tugujezunanidetid.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/47662505364.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/53617963252.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/xuxokopusubakil.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/pizitolukagulefamazi.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7646e5f078---labukokededimasebakam.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/b34d261f17fbaf05c5d1c6268c880dd3/wamisej.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/wivivazamenotaso.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/96745999905.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/mazujozupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=uralic+languages+pdfPDF link annotation
    • 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_off000146ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146EF 16080 bytes
SHA-256: 6ec0a307146d9be2bdd9dd9a35227856c774c3cce985d3f038f6c9b4f02e256a
font_01_sfnt_off00015c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C1E 25532 bytes
SHA-256: 8629e4beb01a9caef35720933f9a5b85e965a2387898c3d23da990ccba642881
font_02_sfnt_off00019d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D6A 10684 bytes
SHA-256: 78c73a08781d884b2a6bc9f8aae80869c198ba1a0b2d4f503d41ac89662b236b

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