Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a69a593a762a8ce…

MALICIOUS

PDF

91.5 KB Created: 2021-08-15 19:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 8d446a53f4a04406673f51b924f0e7fb SHA-1: 4524136af22aefe75bf9da78cd928d524c37316f SHA-256: 8a69a593a762a8ce8d8377ee44726dbc4013750ceee6c80153cd56cea7f6f9ee
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 or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and URL distribution align with common tactics for luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://stratasphere.online/userfiles/file/54836100465.pdf In PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/fozivug.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/38467141556.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/josezet.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/34201817796.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d4b16998d---16986317498.pdfIn PDF document text
    • http://hsiwww.com/image/files/20210724_090700.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/ce2ac422c11439dbe91de309af2cd066/15881503630.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/61520801554.pdfIn PDF document text
    • http://sro52.ru/uploads/files/fefoba.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/44788428258.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/70616413169.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/27795375778.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/12967262831.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/4dnipa5vh5vb53lcm4f2i88001/7732959611.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/xatasedunonamupiberuboke.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/96940688302.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/89260583543.pdfIn PDF document text
    • https://aedwea.com/upload/foto/nodogijib.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6d52c7f582---kitubixuzoke.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/212a7c76ebac1a0f313d4206b740a500/9111243725.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/85777616334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=aaoifi+financial+accounting+standards+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_off0000fbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFA 10744 bytes
SHA-256: a9c98794f960c348a500c20971f2e192dedf78a1eae970db065b1b94b6278bde
font_01_sfnt_off0001149a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149A 18328 bytes
SHA-256: fe053647517769d3df3d0ef56951a1aa1221e0015435c3dd436f272df8ab84b7
font_02_sfnt_off0001459b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1459B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1