Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed95742f668a6c0…

MALICIOUS

PDF

74.6 KB Created: 2021-09-18 06:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 19f56afe8c77665c3bef55f30bd84f5b SHA-1: 0f4695f34b1477f2f4c25c1fc061bebe98a5dfd1 SHA-256: 2ed95742f668a6c0ae84443a48956ef97f067eb6803cfce787fe032a383ad081
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/rabetunanuxesoxarefek.pdf In PDF document text
    • https://censcakmu.org/board/file/files/18040424395.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/11957792874.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/9784060018.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/12470621967.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/256ac129f268a4fa17af88da9f29b557/44514645790.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/pelejizaxu.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/peleloniraw.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090620131573499.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613e91c013dca---fuwenabisuluxigumurub.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/redegetavikuvesad.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/badupiselunojuzejikojoxux.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/jesevebuvapa.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/walagekasutufoxijoxa.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/86753927999.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420aaf1e8ab---82120173198.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/bawimitusen.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/foxudun.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/kuputivaz.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613994003ff52---72917918777.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/21032229807.pdfIn PDF document text
    • http://hijoin.hu/editor_up/27374493942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=og+box+apk+download+for+androidPDF 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_off0000c09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC09C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B3 10720 bytes
SHA-256: 8dc70b2fd4dc0988bee7a461e8421cfd12c99ace0344c623e01cb7273ae6151c
font_02_sfnt_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 17124 bytes
SHA-256: 4476e8b21a339b9f30560cad10632e9f769f0288322423318d6e87a92ebc62a6

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