Malicious PDF — malware analysis report

Static analysis result for SHA-256 8281a1279ca53cfe…

MALICIOUS

PDF

67.8 KB Created: 2021-09-05 05:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 73d55151b7ad86dd8bb385d7c77a72d5 SHA-1: 18ea1204d0576933a2e11eda309bd333ecda1683 SHA-256: 8281a1279ca53cfefd345a69396f74e675efbfd3267fe3f3a813f057dd3d86cf
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a significant number of URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8303

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=budhi+kaki+premchand+pdf PDF link annotation
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609447e3cd5c6---pawadisebisigokakemuni.pdfIn PDF document text
    • https://bio86.net/fichiers/gevorofegime.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/53530363374.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/84326914484.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/natunewoxojifogijakubaz.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/wenafopiselilotijaw.pdfIn PDF document text
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/dujizemabuxexixidimo.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/98472930953.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/tazofazagulumebolol.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/08ad063469a435fe561fed619b0f5533/77845513615.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/80776021128.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/xiwuxuzow.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/suwafoti.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/f9d2efa31d5a59190bbc9a5d3cc2be6f/tuduluzexirososig.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/42ef2dcba48fb3ce5f35f3be09af2eda/mepudabugojarovig.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/xeropodotisedugexuk.pdfIn PDF document text
    • https://andrejc.si/files/file/75924183518.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074298a94ca1---10383095815.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2223b89c7---goniwonekosibufuro.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608be98e8cf48---tosuwexavinejime.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/guladusisobiwunukovovum.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/f57bee3e0450254be0349dcad7c2f956/12664248653.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/89570968708.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cc6381922---68020276991.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c06a99df971---72385445403.pdfIn PDF document text
    • 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_off0000cd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD64 20112 bytes
SHA-256: abf40adf5894bfea5e43c4c103c68423f20e75692b0a2465ad7ce0e68121e1fc