Malicious PDF — malware analysis report

Static analysis result for SHA-256 95fbfee82377de3d…

MALICIOUS

PDF

98.6 KB Created: 2021-08-12 13:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d5c58befa848d5cf9605ec40d38a2f8e SHA-1: a5a61bf1f747a3431b39ec23423c30be518bda82 SHA-256: 95fbfee82377de3dff997b5a714a8502662aa640710e5c5e338ebced5c8f96c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to download and execute malicious payloads. The PDF also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites hosting PDF files, indicating a potential phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608654a448910---32538291176.pdf In PDF document text
    • https://iqmuseum.mn/uploads/files/fevepavifemebabug.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/xozidefuvokeremuralovok.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a4a0df508---75519751593.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8939132cb---55088067737.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/buvudawidomawopomixubodo.pdfIn PDF document text
    • http://e-hane.com/files/ximazuxabizinikesobuk.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210707083515.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/31801879666.pdfIn PDF document text
    • https://aromamarketing.md/img/files/14471663076.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32ce76fab8---47504814632.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/99178866955.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3db812afb---wubufekewivor.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/jegefixiwo.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/giwazuj.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/96a449dd74ee5be758b525d0a23583a8/80793514656.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/34615796546.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/vedowesewagupukejiliwetur.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/25244354631.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b675dae73---vulobutunukaz.pdfIn PDF document text
    • https://2acontractor.it/images/file/bikufemoni.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/85259934191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=exercice+d%27entrainement+foot+u13PDF 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_off000114de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DE 20584 bytes
SHA-256: c5996ced38b9187536b973f85e9913c1dca5106d6f7864b23cf45903446c1eb3
font_01_sfnt_off00014993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000161aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161AA 10864 bytes
SHA-256: a7d2537d42228acd656cd71069cce74708bdb910fa3380715f132c5f77cb832e

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