Malicious PDF — malware analysis report

Static analysis result for SHA-256 4146b63cecc00979…

MALICIOUS

PDF

74.2 KB Created: 2021-09-22 22:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 18d0139888fbf94930021e08658cc710 SHA-1: 7f50d2b156e9666183744d7e78991b150455d1d9 SHA-256: 4146b63cecc00979dbe772bf948d0f8a75090ca33ea71897b78915ba1e93cc04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, several of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous unknown URLs suggests a broad attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2ba05804a---gorobif.pdf In PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/cde81f0dc4a45325e16d09bf8ee621a7/dedujumolijulawezazeb.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/majazatum.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/rapavumuxomagutosu.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/4104321530.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/70796873083.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/86597812645.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/18779688188.pdfIn PDF document text
    • http://marketingnews.fr/images/file/10053525869.pdfIn PDF document text
    • http://tavio.su/files/file/zipapivawamekud.pdfIn PDF document text
    • https://alev.az/userfiles/file/68760279976.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210915163459.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/zelez.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/gevodu.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/73966907935.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/61797782953.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/55623773635.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109090747453218.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/79488132502.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/11847577461.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/rekolixupikuxebejoz.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/19179533260.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/76112840841.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/xinivumilebomovigonute.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f7eb11342---43194604843.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161370d6aac9e8---wekapefefapid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=apk+piano+tiles+2+hackPDF 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_off0000be7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7C 17100 bytes
SHA-256: dcab94f9b2f63e677e67024360c74c184c66509b02dd7d7e62b389bd445b6619
font_01_sfnt_off0000ea9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 10564 bytes
SHA-256: 5ccea8646800b1fd3d0872febae455544b70fc929456494322aa921e1d88eb21
font_02_sfnt_off000102cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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