Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab40903a51aac44…

MALICIOUS

PDF

70.9 KB Created: 2021-09-13 21:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f8d30f7f795fa6a6b5a14508ccd1b64 SHA-1: 40085b36db7bcc8d75e2c3ed75fb9b89f285a7d2 SHA-256: 6ab40903a51aac44ee8772069065ef343e9d99de47071424081320bfea295744
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://nomylo.ru/uplcv?utm_term=android+mobiles+prices+in+karachi PDF link annotation
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16132a8a11ebb2---sovagulegimijege.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/musopuwaxego.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/jowugepamataguxuvosimo.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/74448896539.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/17377592314.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/nokigid.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/ae6b417e7f49dd2cd6dd82fafb85ab7d/27573294881.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/refadexubuma.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/pazamikotatex.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/kominuzesikubakele.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613122bf61847---66888291680.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/19781848068.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/supafedunotovonuje.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/89748879406.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/62220462244.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/nosuvepixidokuruj.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/c76046210912b4641c6b36d7a681c87d/25278974488.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/kugevikigugepexupu.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16137f73850410---liravadofewadoxifawovof.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/kufotakudozikawet.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/91483605763.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_off0000b512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB512 10896 bytes
SHA-256: 9b7861acdc9dc589ccae86b7ee40237ade7083541e2bc2cf118556ea9f5e73fb
font_01_sfnt_off0000cdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCC 15640 bytes
SHA-256: 523d7e722d95b1cac5148d43b5d560f09413b22e39bbc89b941d97e79aa6ca43
font_02_sfnt_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1