Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9adf2f74f3b0e6c…

MALICIOUS

PDF

83.2 KB Created: 2021-09-10 12:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 27160763df0aa07449598aa8e15b3cab SHA-1: 7e05b2894e0de7a424c29f6fb41ab52333aede45 SHA-256: e9adf2f74f3b0e6c50ce8823d085ac1e464b54cc2b2f0330d3243bf247da51ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristics indicate it functions as a link farm, likely intended to redirect users to malicious content or phishing sites. The embedded JavaScript, while not fully detailed, is a common vector for further exploitation or redirection in PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cochemical.com/upload/files/50341349219.pdf In PDF document text
    • https://arvikabc.com/images/uploadedimages/file/72541716812.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/xulobavewoker.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/35488197484.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/64111755961.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/1631714837.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/64979266430.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/zixipepezusaxixoduf.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133176796b13---kotunelijunabit.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/l79548qhdijnfb9mqnkre6sb2m/xepepenexafewot.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/wetun.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/tutavijim.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/21048842759.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/65504948317.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/biximarixix.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/26935915483.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/ruzalekeliladepiduk.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/96544021021.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161389dce99669---81087615208.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/60859921332.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210909_4C300E118A83B2E9.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/zilapozepaminidigivofutuj.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/2595490153.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/tonos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=dungeon+master%27s+handbook+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_off0000ddbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 11176 bytes
SHA-256: 849ad4cf018d13f32e52036a10903a74a34a07ccbe05d849c3fddeb70e048aec
font_02_sfnt_off00010f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F64 18204 bytes
SHA-256: a64a67120baef58b35a4d3bf9458ccea243c00e04542831f26953618b5e36a28

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