Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7daed34573e1eb…

MALICIOUS

PDF

99.1 KB Created: 2021-08-02 21:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a50f70ec64a1f36e3f82bf803c5a302 SHA-1: 5853bbe8ead27bbf042eb838a4aae1ef868da174 SHA-256: 5a7daed34573e1eb35a2d64c90e646c7ad36f1ca983233123c4bb8df0069644c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure itself are indicative of an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=what+was+langston+hughes+known+for
    • https://jaiminsales.com/ckfinder/userfiles/files/vemegevijubovilor.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160842f8674432---korokesunelupekuve.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/17394886075.pdf
    • http://usaoxin.com/userfiles/2021-5/file/82598007662.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc6a2d5b51---lazedidoxunatib.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962e934b890---5200258028.pdf
    • http://begemot-rus.com/uploadfiles/file/2021061518490273499.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160895c4930e5b---77244440690.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/2065c925c1b9c1833d02f92109c5b5c5/89716899625.pdf
    • http://at2apigroup3.com/contents//files/gabimatonoxamizerurozaru.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/39imtjjccgc9unutb1n65e4j43/34284047757.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/2ddb5c705f2c9ddac904f304da9fe58d/gigubivaxuxojefatadabub.pdf
    • https://1877painters.com/FCKeditor/file/59659373410.pdf
    • https://emotionalgift.com/ckfinder/userfiles/files/91600892729.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b9ed4de19---8129475541.pdf
    • http://lycee-elm.org/userfiles/file/lufoguk.pdf
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/22881322931.pdf
    • http://asckhn.com/acskhn/userfiles/file/xafinijilolalupukugew.pdf
    • http://uitvaartverzorgingsindex.nl/images/uploads/rarelevilotijemuba.pdf
    • http://lhs1965.com/clients/880801/File/kivumip.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/12979e4eb9e3d03391fd5c8634964ec6/jefulujuvisotiga.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf915526a8---depuxuzefujugelolekevupas.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_off00012160.bin
dc10a7af1cdb834ea8edbf6b8ac3252558d8985f8ba2a9d61e9a8b6a8eda0971
pdf-font-stream PDF embedded font (sfnt) at offset 0x12160 10672 bytes
font_01_sfnt_off000139e6.bin
2ed8c74428ea2489c9e260e78faf31323b0150b6d3b280a4f0489cc371e94feb
pdf-font-stream PDF embedded font (sfnt) at offset 0x139E6 17176 bytes
font_02_sfnt_off000166c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x166C6 16792 bytes