Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ff4d5da288efaf…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 18:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a4c5d2d8078268af62a405d59a0da5ca SHA-1: e978cb7c8e87ecfa663ea41f6b4347cb51692a6b SHA-256: 73ff4d5da288efafa6e9ecc2b658d7d3b4fb2a3e84443ae72db7b63a651c7533
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The embedded JavaScript likely facilitates the exploitation of vulnerabilities or redirects users to malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pixomot.ru/uplcv?utm_term=download+game+gangstar+new+orleans+mod+apk PDF link annotation
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5129d1371---82588548447.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/35844054207.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/bukaroramidow.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/70082579676.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613259bb47e93---57890503950.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/jitexozab.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/58571503176.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/85458903206.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/75087419320.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/fezisujumidujokepun.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/20325568315.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/63479996910.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/51466217488.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/titevajidixomomudiva.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__61386497EE7B6.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/kupumobelebugedilum.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/81363463958.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef6bfe2a0a---89172497905.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210915230209.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/zujozodofibo.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/sulafuvukevobenege.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/46207039572.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ce962da18aa26f2846410b464af5fa36/92107077545.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/debureriviruzu.pdfIn PDF document text
    • https://rajaunited.com/contents/files/wusobaxidibalif.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/52141570657.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_off0000dcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC6 10820 bytes
SHA-256: c131d9f23a639974ad3890efe9be8004be8a728b21ee69827301ca8b718cbbca
font_01_sfnt_off0000f598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF598 16876 bytes
SHA-256: bbddcdcfa90cbef0fe984587eaf73e5350569a6daf8ada8a2c9b8480499fc64b
font_02_sfnt_off0001216e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1