Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf1970f92193f1e…

MALICIOUS

PDF

68.4 KB Created: 2021-09-25 21:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7eda0a716d708069cbaa9d6b4f27dc2e SHA-1: ed810703a543550d4c9ce22e8cac8e69d1a07af0 SHA-256: 7bf1970f92193f1e8d653f9038885bf27d79ab1dc4678ed7cd374435074ad5e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. Multiple heuristics indicate the presence of link farms and compromised CMS uploads, suggesting an attempt to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=free+wishes+genshin+impact PDF link annotation
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/razedexagawazokawinago.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/65744468790.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/bodimiket.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/18482553399.pdfIn PDF document text
    • http://mobitransjogja.com/files/namofoturafokariboxidoje.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/lomanibutewobavage.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/95145865950.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/verupadaf.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4b7682ee4---45722455438.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/90573089167.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/70569415549.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431378df1f5---576372351.pdfIn PDF document text
    • https://km2804.com/ckupload/files/dikegogoxezutamibizewobo.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161313b83477a3---13104820702.pdfIn PDF document text
    • https://nevisnews.com/userfiles/62848512431.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/13681603145.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/zutupufozaluz.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/jifososolusaxukasamonaz.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/xopodazerazedejadikatej.pdfIn PDF document text
    • http://otczenacts.com/media/files/gubusidimarisimafib.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/sogopuvukizojokovo.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_off0000ac98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AA 15472 bytes
SHA-256: e35c5a159437a7e9b100a700ccc2f59c25b48a90412d9fdfc703cf41531be2ae
font_02_sfnt_off0000ebb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB9 10720 bytes
SHA-256: c4e93673d4f922f205a4c012da22476ff7016df27c1bb7b69d62c0cf320377db