Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b259913fee41fe…

MALICIOUS

PDF

73.3 KB Created: 2021-07-22 15:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: e03908c51e0dcbf0c2793af5ee7f754c SHA-1: a27284e34cd8815263a83f3eb7fd2e5594f354ad SHA-256: 53b259913fee41fe4d05cdd3def01c448433ba3a384c5ebb63bf270e44c4a865
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to leverage disposable hosting for link farming, potentially to evade detection or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6332

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://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6f8768827---11461420663.pdf In PDF document text
    • http://jun-travel.com/userfiles/file/fapirerotuzufekitawaj.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/43651544029.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2198e58d31---pukozixexat.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b08f221126b---64683343282.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/cc7f4892109f2489cadbed6c5f0203cc/bifiw.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/f90ae51c4f2ef7810d8e56ce4736ea80/64219440640.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d00400f7f---17813745813.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/22018009875.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/49618501d74374c70e9449e456b28d09/62258289032.pdfIn PDF document text
    • http://nensi.si/upload/file/vazufa.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/45a878188952ed9a14ea0ca48c17be25/jofukijidalujokax.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/resilopafalakuw.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/2a1c625794b8aa2bea4144861aee30db/dukazele.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160809a50755d5---tokisonajojurewepi.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/95092704884.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1052841463609fc5cd30d66.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5aa3e010b---munonodavaperagerop.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/0sujbgjoq7e2l44po59hud2bb2/84456322292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=dave+ramsey+forms+pdfPDF link annotation
    • 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_off0000ec49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC49 10500 bytes
SHA-256: e9f7c611966ef5ef18b424b5a36c3a8b14b14bda8b2bf514e1aec23828a420bc
font_01_sfnt_off00010437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10437 16284 bytes
SHA-256: 54f95a43f8fb3cacef3a9589d7122882ce57848cbc3c17c2753362d49c502663

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