Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d2f1aff7c1e88bf…

MALICIOUS

PDF

148.1 KB Created: 2021-08-24 05:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b80b9791e661608d7a0f104256a0f037 SHA-1: c202c1fa7948ab9afa4aeec4fc493f1f2e518a79 SHA-256: 2d2f1aff7c1e88bfae2ce78298b322083ff4673841962ab44d219efaf7bd7f08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://krisoc.ru/uplcv?utm_term=noun+formation+examples PDF link annotation
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16085247d87517---91329134556.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/93s236rv4ijns5bhiq83spd3pt/67616547704.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/801d180985539356da30f1ece4da6975/79307032857.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cc6bc4403---mavowivuvifove.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6c5ea01bdebe360d6e4d40bd49d475c1/16154634116.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/xijozegoxu.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/40829715668.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/111311224857.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/03d187ef0851159e063dc6b989fdef25/33671987746.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/rokifedutomesipifukaxik.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf06a0bc1---xewizaverifelatusudo.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/884da9f8e29c466f5d84fd2506032e22/66997162076.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/makudopegalipejilupibixe.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/nudubizugawopirag.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/67626686012.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608313b724e40---35981101750.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b65d2807edc---13060478846.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/59367411489.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfac033190---dawojigikimodimuworipeka.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/63710548615.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/289d3e53770e982972fe113337aac1af/fisejukux.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/moraxubumorunu.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_off0001d922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001f134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F134 22052 bytes
SHA-256: 9fc54601ea43090de0df9ad12359317a34361e6e1394eb680a21cc9bb45c01e0
font_02_sfnt_off00022971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22971 10696 bytes
SHA-256: 65a50f9f90385dbf4f4e26d62deec72ea58dea6f7d396bb5e238c474f2426f4e

Open this report in the interactive analyzer, or submit your own file for analysis.