Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff6313b9a7a283d…

MALICIOUS

PDF

111.7 KB Created: 2021-09-17 20:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a3715e738fe7b93ad637c2525087d85a SHA-1: 16a93bf27cd89e3f62a1b7e48eceb5601ba1d4b1 SHA-256: 1ff6313b9a7a283dcf5b92ecc983fb946995de41953bf20bbe52c5d15a2353b2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised content management system (CMS) upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://e2ingenieros.com/ckfinder/userfiles/files/89315403886.pdf In PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/pedogedazudorije.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/radonenanovobomerosube.pdfIn PDF document text
    • http://midel.me/userfiles/file/21152364182.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/29519017254.pdfIn PDF document text
    • http://rc-modeller.se/images/file///89382471043.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/71203609767.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/44673780381.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8389b0c59---80432198838.pdfIn PDF document text
    • https://maximaainfoways.com/WebExams/ckfinder/userfiles/images/files/11737509809.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/bibukefa.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/nisatumi.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/21764647612.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144bc4406027---21541233390.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613058bb16ff7---35344105020.pdfIn PDF document text
    • http://355353.ru/userfiles/file/morutixojobuf.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/ripan.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/0550e00d00a8a2d35b4c3ab25727ceea/xuzorilavutiw.pdfIn PDF document text
    • http://fohow77.ru/upload/file/81501789249.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/85942120890.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16138325682ce0---43810392160.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/jowomulegologugobina.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/4010877cddbccb6381c5597b9fdf568d/vagog.pdfIn PDF document text
    • https://blv.by/upload/editor/files/54744172349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=warhammer+40000+rulebook+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_off00014c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C16 10828 bytes
SHA-256: dc8e6a6f35977313ec74be5c7e0a9a2d053ae7e1c63deefbbc174302fe546a53
font_01_sfnt_off000164d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164D6 19768 bytes
SHA-256: c6202d2b38a6f21e28f07cb4d8ae6493bb3f3aa666c6ad7b1ef01a121e8e7693
font_02_sfnt_off000198c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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