Malicious PDF — malware analysis report

Static analysis result for SHA-256 525d736915360531…

MALICIOUS

PDF

88.8 KB Created: 2021-09-16 08:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 177caf84b22873c7f612c5ad78ff120c SHA-1: d927049057a727afc0d5f2cc2566190c4f82cd51 SHA-256: 525d736915360531ad1c4e4701ee37badc23791139e9a01cc16bebaae1e48ba2
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier strongly indicates malicious intent. The presence of embedded JavaScript points to its use in executing malicious actions, likely related to the redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=afterlife+full+movie+watch+online PDF link annotation
    • http://mfahk.com/upload/files/32669529538.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161426950094dc---falejizozudowe.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///53920920408.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/sowixojivodujutoxu.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/36423290871.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9cc623693---67469468286.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/roxonu.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/94632695233.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-13/20210913070823499131.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/15i5tnfn7m31nr42n99srs6cvm/mofifafiviwu.pdfIn PDF document text
    • http://e-district.org/userfiles/file/rumiborapi.pdfIn PDF document text
    • http://tochalco.com/uploads/files/rimigejiramibanupevute.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/95226943593.pdfIn PDF document text
    • http://mopron.ru/upload/files/47320743925.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/zerudevure.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/58144827800.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/gidemusiruwolifuvudima.pdfIn PDF document text
    • http://grupophi.es/uploads/files/65547965449.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631495132.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/7397085087.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/sokibalinajodetag.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/67553915784.pdfIn PDF document text
    • 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_off0000f7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EE 10668 bytes
SHA-256: 5b589ca1bbbbe8963c7fdfafef3173f7712284d3913884e602eccc122478e535
font_01_sfnt_off0001103a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001284c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284C 17596 bytes
SHA-256: 8d62e0d4644a6050df5af2109c170ee030e6fcc51b2963317ec7069835c9336e