Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03f3b6122d1edfb…

MALICIOUS

PDF

85.9 KB Created: 2021-09-19 21:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 16a86777d51911054ec84364e43d56bb SHA-1: d573318e311674e19d64c2aed54db188a034144a SHA-256: d03f3b6122d1edfb2da751834a62e11bf23afcc06ad6977a840f56c780bfb450
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also features a large number of external URLs, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://inwebjor.ru/uplcv?utm_term=streaming+love+2015 PDF link annotation
    • http://schubert-hh.de/image/file/kerabegoz.pdfIn PDF document text
    • http://rhondachem.com/d/files/78615683207.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/nixusanodax.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c5eab71d5---xuwobe.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/56456992856.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/46667852630.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/12429214649.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/47cd6f5fbc82dbba68a966d3d7ba018f/60587096405.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/rodomemubezibofapitutufaj.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/jusen.pdfIn PDF document text
    • https://educhina.mn/editor/files/kanuzovimefupu.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/gimasikunezan.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/dofepigemotevus.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/682082375.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/64638976924.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/68c59f7c03b9d71802e115b15ce3a04f/71900453004.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/ritepewexufanimaredad.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/78312086036.pdfIn PDF document text
    • https://kawanmto.info/contents/files/55091449431.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/zekonekuxibifidefo.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/xukiranigo.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/lakubovuwazo.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/25632476466.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_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 18908 bytes
SHA-256: db4854ac262fc9a4dd9fe271257806bfb2c6f93972e7f7102e76f318dfe89aeb
font_01_sfnt_off000118a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C0 10852 bytes
SHA-256: b8e6eddae67c972b4782c367be812efb478a50eb321c83fa7b297c18c913658a