Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19443e03dbb185a…

MALICIOUS

PDF

64.0 KB Created: 2021-09-18 06:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fc02407aa266c15e6938882e9c42e737 SHA-1: 1905086ec3cec9125ff0e9cdee531bf8b09897ca SHA-256: b19443e03dbb185a76ffb020a138c08691c7193a51a437e61d98b2555f108f99
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification, likely involving phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5692

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://philabc.ru/uplcv?utm_term=chromecast+in+mi+tv+4a+pro PDF link annotation
    • http://gzbaosui.com/uploadfile/files/demavirotox.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/21947004677.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/69218919471.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/bumizi.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-17/20210917152112934386.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/10583306573.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/86813014387.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/84394867168.pdfIn PDF document text
    • http://orthopediedelft.eu/files/kolen.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210910014236.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/io57fihsdtehrc1no6294m8j90/wogiludefemonexemamin.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/53610920009.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423890a82fe---86507846029.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16144f1f749d49---20869266325.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/57757178167.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/40001281538.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/5005878650.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/datipomiduwadeg.pdfIn PDF document text
    • http://sayarbobinaj.com/file/90431209069.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/ketozegozowo.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/62477304919.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e363be44f---4119419757.pdfIn PDF document text
    • http://cga82.com/admin/File/zekosefuto.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/54450175540.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/dixexeralolofubakuwuju.pdfIn PDF document text
    • http://kaies.cn/upfiles/210901112525574328cgzter.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_off0000c89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89D 10768 bytes
SHA-256: 5354069d2502906b2d30eed55f0aae186d0a8c603df3bab04ee4fbc3f6032b0a

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