Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80edf91ac99d942…

MALICIOUS

PDF

73.4 KB Created: 2021-09-27 02:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a6421ef2a67340d4b2794e50ff9cdc6a SHA-1: 9995c3fa6ff26e6f3e8a9158cedbaa3a7fdbe4bc SHA-256: a80edf91ac99d9429826e78a75d6de840397fc71174b5627ddbd1d5849941f79
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on potentially untrusted domains, suggesting an attempt to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://birizgardenhotel.com/userfiles/file/nosumozipinapol.pdf In PDF document text
    • http://growlink.biz/userfiles/file/gisivatodevovilamigi.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/54759603978.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/vexanuvukokezipe.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/41521436370.pdfIn PDF document text
    • https://assofmt.org/ckfinder/userfiles/files/dafalupanapavo.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/turuk.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcfbda2ed8---dewibonadutivovofebejifo.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/mupubutamezazu.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///42898096335.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/4392138284.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/tenomorumevi.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/93005069647.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/5b5778a5c1bdcaefb2d75cbacd8cc4c2/fajibu.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138fd1fa6de6---9349959766.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109110115515050.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/divig.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210906143248_1uupg2.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/tidilevusorafudagiwifo.pdfIn PDF document text
    • https://arerp.kr/data/file///vobunagamaxagadojaze.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/99500371920.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/vulow.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/86732038870.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/kujozetiwij.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/78557742698.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/roworonugim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+ice+cream+sandwich+apk+downloadPDF 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_off0000b900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB900 17896 bytes
SHA-256: e9208794b4f64b8df11d7892f775cc92b82043681554622f244f5b69e2eef40f
font_01_sfnt_off0000e672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE672 10840 bytes
SHA-256: e58d2654cce20fde98cf96a6a40c8bb3ca6a28cdfebf66479c08806b99ddd0a0
font_02_sfnt_off0000ff4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.