Malicious PDF — malware analysis report

Static analysis result for SHA-256 60527752df95ff15…

MALICIOUS

PDF

97.0 KB Created: 2021-09-05 09:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d4ed15edd1f4261da4ab01c7b6dd0226 SHA-1: f551327b555548edecba47dddb35adf795fb92b8 SHA-256: 60527752df95ff151957dbb3216e8e05365514c00c3578d0b615a8facd38eacc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised CMS upload directories and disposable hosting. This structure is indicative of a link farm designed to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://findmealocalpainter.com/insurazon/admin/userfiles/file/zivodu.pdf In PDF document text
    • http://www.firengo.com/userfiles/files/65044318872.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/3htt353alh7is80enbc010157l/xezozuxi.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/vajewomelusiro.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/821eb08435757de9bf306595c9f03867/27436326265.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///zozewonakugogogovuvakerof.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/jedagumexek.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/655d7297f92f9ef1342fd166882d5cc5/vilibajo.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/24853352522.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/tanmcsmn70c58go3urnsd9uhi5/49460633218.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/96506800037.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/72301124229.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/61597366279.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c7c5912947---fovinigo.pdfIn PDF document text
    • https://nistd.in/userfiles/file/5858073752.pdfIn PDF document text
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/23494855133.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3506637d71---1213861664.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca8af367bd---nixegofiwadazujemiv.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5891190bcb---gunuzodotosazusefegarubev.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/56232273131.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114881cce131---mumutatiborajavipu.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/pamidevusupoguwiwamijef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=lexique+marketing+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_off000113ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 10904 bytes
SHA-256: db05dbeb7289402ffb70e3af961de57f64f061a07b1e0a357e4220e6171937dc
font_01_sfnt_off00012c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9F 19196 bytes
SHA-256: 6a7ae1342608e3eff0415c46bfc302b6199f8b86ed52cd1efd39e90524e8ec8f
font_02_sfnt_off00015eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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