Malicious PDF — malware analysis report

Static analysis result for SHA-256 991ed695b7597d7a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 03:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a225465f7c3c9dbef45bb001b6b9af5f SHA-1: f3c3a1d3c3ce3e5a3e85fc7c821a0b50e4d1aee6 SHA-256: 991ed695b7597d7af9e2d30677c3b1ebdbd793b6f6ff90bd77f836b260f909c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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=justice+league+the+snyder+cut PDF link annotation
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/pafuganivuzobawide.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/jizanuvogojunatagukipudo.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/82163948403.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/kudorosamigavix.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/nosopevobif.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5a2b72c47---93503490286.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/nobuzewabuw.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/nakinonakibivasugut.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/lejulinowejifesupofavasu.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/lejibutufo.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/67069868627.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/jabibopuxirug.pdfIn PDF document text
    • https://sentralperdana.com/file/wovutenezupigadewi.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/jodunetesapuz.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/62469278327.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/kigogedalulonubaxebegos.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/duwimadi.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/16067204627.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/eo195tclt1jc610njc46gbjn5e/37037264568.pdfIn PDF document text
    • http://kco.su/userfiles/file/rovozosisalawazawezezaw.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/potunubimudolevez.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/99576904776.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c99eaf817---18550141658.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_off0000d885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD885 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 10732 bytes
SHA-256: 0d9917c5181d1a48220c400dd22a3fb792174143ba4dbe5e50f95e680bc3ab05
font_02_sfnt_off0001090c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 17060 bytes
SHA-256: 5232f7a21639e14dfc5e980e69eb00b8f297e997f3d39ddf975a504dd0fa0684