Malicious PDF — malware analysis report

Static analysis result for SHA-256 138ec4ee6282b32d…

MALICIOUS

PDF

93.6 KB Created: 2021-09-03 16:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 622408f9abf9a59f1ccc58db66a04923 SHA-1: 612b5e394f7c121748e9a6e70599c9d32eae15b8 SHA-256: 138ec4ee6282b32df9b5286f0b02f22ef271ae6a245a5be83dedd8635569ecbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfc0a22841---ritikugunawot.pdf In PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/62055145347.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/zuduguvuvujaxalik.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/1661195711.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/tojelumarizub.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/75256265110.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/fonuvoma.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/415526c3c6c9c900aaa6aecf82aca9fd/lawovezulotef.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9087cae78f---29750212410.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/b89bb7468bebab8ce59bcc7695d90d62/mixedipebonirufezibume.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f9f511c8dbb---91935368806.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/nozumewofuxerebavap.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/vebibofikenalide.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/25306994786.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/35255513289.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/89f14e1a439c6aa90ea149540fe9ea9a/29715179392.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/1300900736.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/92197290522.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca792b75d2---30183616384.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3b3496171---90374565898.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/3pvo0o5u5g8a0jrhmf461u2kd4/dudebisubuwejefeweji.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/bonijukeva.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/menirimejupukiboduzok.pdfIn PDF document text
    • http://jsdarvin.com/files/58782304853.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/sk9nkv5967v0ejn6vddctbtpm4/lirukafatowoba.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/77075385207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=introduction+to+materials+management+pdf+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F3 11100 bytes
SHA-256: 684a05965f818e684ae16e09a705b10c15c368ce8561e0d6ce0d7ef7fead54a6
font_01_sfnt_off00011eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BD 19012 bytes
SHA-256: bd9169ef67375db13af7caba09862920b90460f6cfb82661db4330860eea66e3

Open this report in the interactive analyzer, or submit your own file for analysis.