Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e30061b35055823…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 22:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 606dac2e7ead6efc514518d0eb729c8b SHA-1: b3965bf511833f73056b8cbd140fcca31967b948 SHA-256: 9e30061b35055823451309e139bb50d286a4c670621b2e2efd14b0f0bffc18db
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised or disposable domains. The presence of these links suggests an intent to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cheesykeju.com/contents/files/xowudosakajitu.pdf In PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/wifuvimasabijekupukuxojo.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210916_56230D7F1A62441B.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/wewesoforuva.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/82615328745.pdfIn PDF document text
    • https://clubon.top/uploads/files/53043960106.pdfIn PDF document text
    • http://thepducphat.com/upload/files/68537006333.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/mowewuta.pdfIn PDF document text
    • http://vuason.vn/upload/files/52908352428.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/031258013398.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/26336706996.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/69623150093.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/ginavarerufa.pdfIn PDF document text
    • https://jensbrode.de/files/file/51423258663.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f496692b3c---suxamogevapejadunazi.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109080244235362.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/8661816472.pdfIn PDF document text
    • http://ximangsongthao.com.vn/app/webroot/uploads/files/93103994679.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/maletobefibipudeluxeduna.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16132ae0784d79---97498800914.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/reforixusixakararazofivod.pdfIn PDF document text
    • https://attack.lt/images/files/52836919342.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac2ec82121---55772048133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=happy+game+cheatPDF 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_off0000df4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4E 19312 bytes
SHA-256: e173958c3e77502f05cda943b55c09849cc7667b9c3d97781ec2011daa39bbec
font_01_sfnt_off000111a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A6 10296 bytes
SHA-256: 82d04a6e983bdd85401898ee5d9199cc1e5beced157c595a2a76f1955bb5e990
font_02_sfnt_off000128dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1