Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc63acf0f0348efd…

MALICIOUS

PDF

164.8 KB Created: 2021-07-01 20:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4abf7ef74da228b3238db1c18862819c SHA-1: fd62a2fb5d3170e803efb385fc9fa921d2c3fe35 SHA-256: fc63acf0f0348efd39b2a538ea4396620dbf0586682e60c2db71dc3cc28ae508
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, with several pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://jgbt.us/pds/userfiles/files/61003566911.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b107b7ac7ba---54469869832.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d020fe5d18---rufetuxonilerow.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160826e9272c40---tijowogapovosopu.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/54716742895.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f83f6f8a1---rizivunibavosur.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b082e3c9bde---sodejakojo.pdf
    • https://songhong.info/userfiles/file/buvoruzixapakikonugas.pdf
    • http://boothbayharborshipyard.com/userfiles/file/58408219665.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f52c92236---63379204645.pdf
    • http://gaongonmaiphuong.vn/webroot/img/files/zitidolawepinude.pdf
    • http://wsm.hk/images/files/84232042631.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/cqe118enb9d3ab9ogarbe41mpq/69079980165.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/op2o695s1j4048rmrqgekm06hu/fatuzawufapatonoro.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16098f50b03a05---40825873481.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/98a484316d021ec56a3e58cbe43c98fe/demekezakivufu.pdf
    • http://metabolit-plus.ru/files/file/pimidonowuwelevuv.pdf
    • http://aodaibooking.com/FileData/ckfinder/files/20210530_18674695CB03080E.pdf
    • http://vencedor.coop/images/admin/file/vebama.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6bf05def8---logubokuxewiburinezuzupe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=worksheet+on+linear+equations+in+one+variable+class+8
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609754fc73b06---19200015007.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000223a6.bin
62008ae7d1b5b866e70630ac804b52676326ae6880f4e0c34aff034a052b7127
pdf-font-stream PDF embedded font (sfnt) at offset 0x223A6 17996 bytes
font_01_sfnt_off0002536d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2536D 16792 bytes
font_02_sfnt_off00026b84.bin
83ef2f0226944eddcc902955768572696d8e9fd1b2a926deca9383e78522aab1
pdf-font-stream PDF embedded font (sfnt) at offset 0x26B84 11072 bytes