Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c94467b7a1451f…

MALICIOUS

PDF

64.0 KB Created: 2021-09-02 16:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 73e5163b0a7a2c83885333de4efa0271 SHA-1: 164d39b50a887f9283ef61f196f7093569a7fa48 SHA-256: c8c94467b7a1451fbc72b42e0c7fb75f4ab69bd82fa49a0434a8aa42c45c893a
154 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and link farm heuristics indicates a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7938

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 http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/90cltu3rc7ke6sh8abj2oedu06/beloza.pdf In PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/09quuj23be3arr4enqp94iibnc/35273637479.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/95230275061.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/popifukapabanofosenirejo.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/90adbf9470c46317909052275db428df/zijimifobufusotukixusudi.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/vikadurifixugubez.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/pufomofoleviruzelofuvis.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/m6m6immq8i65nqai2dck2b7lsn/66379175410.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854ceca197d---zonisop.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/3aec7e88e7c5d06a49a2511524230d4b/86415872769.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/816aaad3e9149f8f1d593a3ce3008b89/69276590084.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/defanoxaselijanixikamemu.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf804c96ad1---lafibif.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/4cb5cc34f3ad2617f1aeb64a764c3da9/93405705408.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/62759027525.pdfIn PDF document text
    • http://changecn.net/ckupload/files/jamazafe.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/64513279305.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/navujudowekosuj.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb86d47f100---gukozaviw.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab9dc5a529---27886592133.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/74683841661.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/49856883898.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6380624f70---lelatiwumikanulubare.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16072bf4e64713---54643984053.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1a45ae4b9---45167329338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=group+4+syllabus+telangana+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE698 11052 bytes
SHA-256: e54e754695e3b412ac1c7f868a858787013ecee80ded1c30346c7e3cc1ae57fe