Malicious PDF — malware analysis report

Static analysis result for SHA-256 858e7115213f33a8…

MALICIOUS

PDF

79.9 KB Created: 2021-08-21 21:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aee789197c0ad794f2144d169c4dcdef SHA-1: f0bba2beb797d44da911ca08c3d4745fa955ec58 SHA-256: 858e7115213f33a8c4e46ad131ccc7188d8e86f09917db644230220db48a34f0
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF file contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malicious redirection attempt. ClamAV detected this file as 'Pdf.Phishing.Trojan', further supporting its malicious nature. The file's structure and the presence of numerous external links suggest it is designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

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://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/zedofeledekadoxugij.pdf In PDF document text
    • http://sequirk.ie/userfiles/file/lilalujijajaroxebegevig.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba42c442b---25970900729.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091965c629f6---98289868636.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/tajuluwisawixiwomogine.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/71099811032.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/0p5djgcnal3pj1lm7d1ecen3j6/sizevudijoxapetizikivadu.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/6a0c5a190eb2ea9877437edee420ef43/89005254183.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/vexolomebiruzigipi.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/c1e40b235653dbe2a11e43fe9d79960f/28908422246.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abdf879e774---liligafotiw.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/pugasilipavosimedavano.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/88426456738.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/49587223718.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/57426406897.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/wuburu.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/38368247355.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/tuvudatirufufajiwuduna.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/afi61svgsat0famuh7ls49d1pt/zilisovazoxolus.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a582f2d02---donakogabagajaw.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/uvfarjesr08vrdb34rs3geio2j/4089031044.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/153082291560ff03666aab6.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/xodefigapugola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pes+2016+license+keyPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c5cde1d87---22620491028.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
stream_003_off0000e160.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE160 22756 bytes
SHA-256: 6f80990c8c27126cc59619f0971921dee1e591bb0674fac34e1babd77a34e40f
font_01_sfnt_off0001098b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098B 18804 bytes
SHA-256: db3efad3628a25eb4e99ed5b11c5d337abbcd55167d1f720199973edf490bab2