Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75955cbb1dc5486…

MALICIOUS

PDF

73.6 KB Created: 2021-10-05 09:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7348b1b6b6a9f0a0540f605e2a01cd5e SHA-1: 7b5693a95e498c6d50b5656f04d6ca4403c48ff4 SHA-256: c75955cbb1dc548643fb5f215b45aa8fd3accef193a9d8b49f6249a04479c034
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute code, likely to download and run a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=dry+white+patches+on+face PDF link annotation
    • http://aptwash.com/userData/ebizro_board/file/pisubegotosobarezirugumi.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/lojejagu.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/95632081770.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/samebemisosepekukinigepi.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021100513552345.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/99784430260.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/87940195487.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/wadavotaw.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141608b4e615---pawobuxaxulo.pdfIn PDF document text
    • http://bollnas.boj.se/uploads/userfiles/files/pedegakapasivoru.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/sunujinafeximeteneliwazur.pdfIn PDF document text
    • http://195exim.com/datas/files/35299971487.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/xopujakigoguvovirarawobow.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/47639575629.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b15a2e9d64---nufipitobosave.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/24911930697.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/36924618313.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/2befbe96b37fe598af9b6399d9c863e6/84100786211.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/jujetawesitixumolono.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/kezutekupiginatezak.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/wasojukaxigorebalaro.pdfIn PDF document text
    • https://energooptima.hu/upload/File/zamesidobeduzuse.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c98dadf857a3cf255aa2f5aae90c759a/jimuwezore.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/xebilofubesexukovu.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_off0000bda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BA 16804 bytes
SHA-256: b38cef9f2e1fd255a661c61eb2d5fa0703e185eb6aed75d38de2ec2df8d6abd2
font_02_sfnt_off00010024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10024 10732 bytes
SHA-256: 39867fd3aff03dff872fb5985566b27cde18d99c8348653864bb73b57b4829c9