Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78e0ae7995be315…

MALICIOUS

PDF

83.8 KB Created: 2021-09-22 09:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bff3bc7b354db0d0a2f8c347cae499a9 SHA-1: 0d0b5a2e9bf1c834267de2c6dd6c2c9e1ec11aa2 SHA-256: f78e0ae7995be315743005723b30363b0693b896b8a92ef8c30786e86f2a9f15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to link farms hosted on compromised or disposable domains. These links likely lead to further malicious content, such as phishing pages or malware downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ocean-ex.com/images/blog/file/pojedasige.pdf In PDF document text
    • http://abwcolley.com/uploads/files/58598390453.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/71794020697.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/logesezosiwoxixawasune.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/wumidabuxololuzazufogu.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/lemaxoxonozogevetisero.pdfIn PDF document text
    • https://cristalensi.com/public/File/bopejisifixomewoj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ad8e80bcc---wejarusevumotefixelosaja.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/48940218298.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/15873712891.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/64806926870.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/54355342040.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161408c7522c4a---80799582391.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/24706428487.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/69638561930.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/vodosufewavafogo.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/jiwafiloxawopajosize.pdfIn PDF document text
    • http://apex-architect.ru/images/file/54292343301.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/87070913037.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109120203155864.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614acd38b0d28---bobekigoludujo.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/89789771090.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-1/20210901160137618042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+psychopath+test+pdf+free+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_off0000dfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 10788 bytes
SHA-256: b5c0cf62699a8a83e6af2a5f05356a637a7d7701bcaa2c1db40986fda495618c
font_02_sfnt_off000110bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BC 19028 bytes
SHA-256: 59c1294fd9f27f10734ef5e0f9172bc274640669dd4f25c6bcf43bc2d235a0d1