Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e258eca51d552e1…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 18:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7b58900418588d1dc61f5a338d066f20 SHA-1: 6fc87ae49e2a0562990bfdc778f3d6b9a3a0d360 SHA-256: 0e258eca51d552e1244220fb2d7d43def0e40bb6ea3a62165637101008675a5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Several heuristics indicate the PDF contains external URIs and links to compromised WordPress uploads, suggesting it's used to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=ae+dil+hai+mushkil+full+movie+watch+online+with+english+subtitles PDF link annotation
    • https://www.adoz.cz/ckfinder/userfiles/files/2162463988.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/67576371421.pdfIn PDF document text
    • http://topflexsports.com/uploads/fomizobetixoluwegafinupu.pdfIn PDF document text
    • https://interconformity.ro/images/file/6711464363.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/xiveraxigorojovakomi.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///zezowenivo.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/14696617401.pdfIn PDF document text
    • https://blokhol.com/upload/files/biguradowuduxufijif.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/dc3594d6cbd3d80177db8c3a26d2ef9a/6939096265.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/70766364101.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/58740030436.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/xusepenudopodilopano.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/36381920224.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/15285328223.pdfIn PDF document text
    • https://penzion-palice.cz/content/31820314283.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/sozabokapasoru.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/zogozavugawebomadu.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d64676f9ab---luxolojomufupokebas.pdfIn PDF document text
    • https://cncunse.com/d/files/regedozixaniwanomino.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/e74316e43ce52c7c0da70b19d31082f1/7203139005.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/valipivovutiretotivare.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_off0000acf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACF2 16296 bytes
SHA-256: f88eeedb0bfd0f9eaab4016deeaa72356af3dec65c788f1b33ec4017c12202ac
font_01_sfnt_off0000d6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BE 11288 bytes
SHA-256: e498b171fb76cde6372b49f5636dacde469c9905bd0cdbcf0f40392421b39f67
font_02_sfnt_off0000f0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1