Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8b48d3909674b9…

MALICIOUS

PDF

98.0 KB Created: 2021-09-02 06:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 258e0389c678c968d757a715c3edd052 SHA-1: 5e232a5152ece99e5edbd4f3dad6826f76a3a18e SHA-256: eb8b48d3909674b9c97e22736f294293ce622b9895a84c38e485fff0a422bdec
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to numerous compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The document body is unreadable, but the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://sonnenheizungen.ch/fckeditor/editor/images/file/nixasofodizemaw.pdf In PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d20aed4dfa---31065679730.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/5195606178.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ed4ffa4ad4ddd746e85d0b62315df958/65963592546.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/sudigi.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608086d69527f---puvuvesemowa.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/zolaxixogulodit.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/07/202107240755099594.pdfIn PDF document text
    • http://reunionfamily.com/clients/6/6c/6c58f7de0247188f02debbcda007d80b/File/22570323637.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/puxezosot.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/76490629656.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/ruvozinagabuz.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/65206646505.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/9m6do8i0tnbdn930191s8g26v1/gekenul.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/s3d6q00b1ncl5aa1gl84jkd9pu/zepovoroti.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc144011f2d---77188326853.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/beguzuxivozovitefifo.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/timafozizogelojezijalo.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070079add929---93097729975.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/betedazilaxilijuwunot.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/1342393298.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/2943174771.pdfIn PDF document text
    • https://inks.bg/userfiles/file/mofozigula.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/18793506518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=deuteronomy+32+meaningPDF 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_off000118d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D1 18652 bytes
SHA-256: bbf2265f7517aef8563e9501b4fd39eea2cb357e396fcfd08132d8d7291dd661
font_01_sfnt_off0001495b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1495B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16172 10744 bytes
SHA-256: 6b93aec59b8c37fef7b6b6c124c40061f48986f9454790fc78502b65824d5a27