Malicious PDF — malware analysis report

Static analysis result for SHA-256 99134f4b4cfe55bc…

MALICIOUS

PDF

81.1 KB Created: 2021-08-02 11:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b3397bbac322d18a122705f459930bf8 SHA-1: bb552fe8640c44e18e42c089793964b82d6771ab SHA-256: 99134f4b4cfe55bc770239d58c972340d0faf85b1928366b108515d181b5b933
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or trojan distribution intent. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3641

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.
  • 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
  • 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://irlanc.ru/uplcv?utm_term=oktay+sinano%C4%9Flu+eserleri PDF link annotation
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e07eb5a5f---13110428902.pdfIn PDF document text
    • https://petala.gr/userfiles/file/93787668595.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/rusodoxe.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/92425942839.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/tikitalafugatap.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/dec7fptt3i4ga4h00uk9svl4i5/bifijoj.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/49177943474.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/42ca8611e91988651b2108afb97587a2/99814136564.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d714949021---xitusomog.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/kufutexasipav.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/24533548011.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/zarena.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/31213885371.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/5890153589.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/79df3f037a5105b91ca652423b8d5ece/fofikerituxetoxuminado.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/ee3fae9f923cd77a8a585de8dfeafb7c/rejadeleselativemes.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48fd8a48e---xogukobobobevu.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/aht002sfpip3sntt1atmhqddn7/16885219497.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/soxomag.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/16545872753.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/pimituseronasilotanonuvir.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021080105380245.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wewonuwoji.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/bopelawu.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/9b7cf5fc848c4c2c8d97f87b24c9325a/zojon.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/lupupule.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_off0000f4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDF 21716 bytes
SHA-256: 2d3b06c323e6952a422830a4d4f2795506526278c5c257e8c53f7fe2ddedfbc2