Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea69a50b6c7666c…

MALICIOUS

PDF

82.2 KB Created: 2021-08-24 09:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f54504b783be3b2aa2979fa9b8a5d2ff SHA-1: dc00fb5cf63c0f962b22fe338ef3053ae64660a1 SHA-256: 5ea69a50b6c7666c6c74a30faea969b58e5761ad7399ce238f65e3a149e26f40
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • 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://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/8c9d25311ebbeb8dbbe1fb6f1b39c4e2/bevalagitaki.pdf In PDF document text
    • http://stardentalcare.org/userfiles/file/lurubogumuposawub.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160edc22a9c26b---84257132862.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/11118567627.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/s7gqret7rj3qsjasvclff4ubn6/62073817624.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e78dc5659---56709679464.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f52d6d831---39450249642.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070fd817ba94---47926716685.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/murakojuwe.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/roditukidime.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/7728405309.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/89771407665.pdfIn PDF document text
    • http://stisk.com/file/15862182315.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc68cb03740---ketas.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/75761967815.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607acf0d21e5a---68706542250.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36048646189.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/82001544067.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/zutefupofolowoxosu.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160842b3d5fd65---81507697873.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f62e1b22ad---88402306485.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/32785356001.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/95684860651.pdfIn PDF document text
    • https://cecprint.com/images/file/76632319581.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/wibagotowarapulosubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=extract+page+from+a+pdfPDF 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_off0000ddac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAC 10636 bytes
SHA-256: 645c4ea5c6bcf63c85d6b1d58a9c6e87d0421e2c4b40cbf7aba9be18e6dfb92c
font_01_sfnt_off0000f5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E3 17112 bytes
SHA-256: 41d99c59291f3b65785cb2f6b1d4423eddeb82d7f439256fdbd7aeedc9447532
font_02_sfnt_off000122d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1