Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ebc5793b37658c4…

MALICIOUS

PDF

72.8 KB Created: 2021-09-26 22:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f003e59ef48fffd3a838b224fb008421 SHA-1: 2ac30ebb166d560189b804d3c933986f2afc061e SHA-256: 6ebc5793b37658c4c15edc8564761d6c45d35ab07fe5ffbb316a07f179677547
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a link farm structure, as indicated by the PDF_JS and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, suggests the file is designed to execute malicious code or redirect users to further malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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 http://gnatowski.pl/attachments/file/vapikulegixugezi.pdf In PDF document text
    • http://footstepfloor.com/upfiles/files/pojegut.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/geliveg.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/32853159871.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/12818559087.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/dixakikakinokudijezu.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2d444b2d981c9942908d22c45d6738eb/wogalepikonaz.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/94595880731.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ab95be3b677ca86ec76fa893d64024ed/dijifo.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/11612186673.pdfIn PDF document text
    • http://axwelindia.com/uploads/dudiwofosevibu.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210924163857498.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/rokifu.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/zigureledixumunabajuvepam.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141657886475---melitasiti.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/27060448332.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d43357306a---39326062276.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///fiwisasatebiwojajasidodal.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/bojapizojafiw.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/lijemofo.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17666746209.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/zozidaminemeri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=touch+screen+repair+pro+apkPDF 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_off0000b421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC38 10480 bytes
SHA-256: 0600460cfed0d463de08f5cde7e10e7ad22a2ee021895b5d09d06cfc57bff54d
font_02_sfnt_off0000e400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE400 18988 bytes
SHA-256: 6f2f45dd901ff85264b2c22a91e21cc8c6cfd24ff9fa0d20ad5eadfaa4471e0a

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