Malicious PDF — malware analysis report

Static analysis result for SHA-256 de35e8c68e6cc087…

MALICIOUS

PDF

69.6 KB Created: 2021-09-13 01:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e48d9ac83ffd1a4fb4c821b51c9467e8 SHA-1: e083420c89a259ff17a125a189ff10a69a98b1d5 SHA-256: de35e8c68e6cc0870f1684cb9e4f2ff31f26641d8eb5aace306e63bc6c25b4d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO abuse. The embedded JavaScript is likely used to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://medvor.ru/uplcv?utm_term=iphone+11+pro+xs+max+price+in+bangladesh PDF link annotation
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/woxoka.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/c2ea39afebdbb6c2755440fc31e50654/20253917766.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/17319156449.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/79279289323.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/34466114498.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/vemifuwarezivinevusegap.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/vozixapajivirurovev.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/jazodukuxexigo.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/sasuparogarix.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/36302669230.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/vatinarotixuram.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/sojef.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/muzetixebim.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/4287ac758f742038842f39c83004a5a7/67631932522.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/48185756564.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139b46aa0b72---45387905969.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/23012994169.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/nurewotupoxijufug.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/vifosozorogaxakokaju.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/57057171760.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/vaburuwunonoxukesilojado.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/sanuxud.pdfIn PDF document text
    • 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_off0000aefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC714 11108 bytes
SHA-256: 8c724c7df2c8d0daa490098ec8694d51ed21d1a5f205c7e6238e2e99d0abfc88
font_02_sfnt_off0000e063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 15748 bytes
SHA-256: e29eac0f81482d56a6d6d7017e6ae9a597ea7baab1cc0c23858d51bfaf83a556