Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6f45d225c0f0c9…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 07:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 305588217561f3bea3d237730b048f6b SHA-1: eff212dd0da8c145cf97b2830f8f01d3b46e0f55 SHA-256: af6f45d225c0f0c997f4c7c4408f00d1624ecbd62aadfe0f07844065cf08c4ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=amazon+prime+music+android+download+location PDF link annotation
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/kezidokofudetuzogetu.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/74811788767.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/pujolawiluvumobedotanoja.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/wulosurik.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/zagawonuradigenojubikukev.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/febabi.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16148f65fd5843---50955724036.pdfIn PDF document text
    • http://clingac.com/d/files/rezezanupapo.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210909020545_7t6ggn.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/39741147333.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/54265613562.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c023b698c4a84408d879f4dd72aafa6b/72592899061.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/68078930667.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/85692122937.pdfIn PDF document text
    • http://rrarental.org/upload/file/61432925147.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/wesedodadobupupusibumisa.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf3a07aa94---43010532510.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146cf2615efb---lumuzixoxopenogovi.pdfIn PDF document text
    • http://presupuestos.pavysan-bigmat.es/ckfinder/userfiles/files/fotosawaxutalubilinapuwaw.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/6509502606.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/pexiridexeviwumowe.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/mulijadaram.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_off0000d776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 10900 bytes
SHA-256: 222ffb7208015567af6727ec82a3c70a921dc9c30dc34dcb7fae02c819f1c964
font_02_sfnt_off000108dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 17468 bytes
SHA-256: 965595d97bbdbdc2159068e15e416ca3161e9fc525ce8383ccd7c18da98a5d17

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