Malicious PDF — malware analysis report

Static analysis result for SHA-256 6323fe82c9d69e51…

MALICIOUS

PDF

93.2 KB Created: 2021-09-19 12:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2eb63f8f9c66c0b1c730057d64ae4fcc SHA-1: 86de1d7c232c052645b9c4e96c16416b9ef01466 SHA-256: 6323fe82c9d69e51fd431f2f99919d6aeb6ae99c40689b05e5a35f445d22e523
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to disposable hosting or compromised CMS uploads. These links likely serve as a link farm to redirect users to malicious sites, potentially for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://wastran.ru/uplcv?utm_term=movie+creator+android PDF link annotation
    • http://ouhkpthaa.org/userfiles/fozawivofurapafaper.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/puxodoxupadi.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/50169332270.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/44137927291.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1ce8573c008ed57705a06384e5812f2c/48935160435.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/9ddd4e205f35cd093c1ad3aa38fa4772/fakodekapasagebomaba.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/37783638041.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/gibarunalokete.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109081623143837.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109120316059309.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/lokaseminerisur.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/23196556997.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138a356d3879---21792494575.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/zovewenorega.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/58606641480.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/42358255682.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356eac0657c---gasaj.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/tonavu.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/55194857464.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210910_113407.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630864896.pdfIn PDF document text
    • https://medpressa.ru/files/file/xajigipixedid.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/70857377770.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_off00010759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F70 10208 bytes
SHA-256: 0ba4fb628ef549585f9af0d8615832c310eab31a42ba2d6594646972a12a4dca
font_02_sfnt_off00013678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13678 18704 bytes
SHA-256: 118619fc36a4733057b8d63c2e0e2c47cdc05e5b4c44db9f34a9b6eecd7454b3