Malicious PDF — malware analysis report

Static analysis result for SHA-256 df64592d0bb5b7e5…

MALICIOUS

PDF

85.5 KB Created: 2021-09-05 12:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3b867c6c17c114b61041cf90e881982c SHA-1: 8a3553e8769463e6facd8bf91f422f79dd7fe457 SHA-256: df64592d0bb5b7e58588a2fbb087729eddc8e600504d8fd89f7e7ff9887a375f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of external URIs and compromised CMS upload links strongly suggests a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=caracteristicas+del+cultivo+de+soja+pdf PDF link annotation
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f72d51d4dd---66942580923.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/11894727768.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/95555404819.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc17654e10---36932743770.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/sepiduroporemu.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a1f118184f64690daf0ab9f416fe3d4b/nopapudoja.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/pikoxujazomagoxalivozizim.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/95998781378.pdfIn PDF document text
    • https://dm288.rs/slicice/file/wawabokiv.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d83184d356---28882923863.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160999fa8dad3d---69573290064.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/i5n3k91siafamf6754mieacpik/43058730894.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/78264178572.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/jixoniroduvipodaled.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160739bd2e5afd---mowirexoruvajobovuwag.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/us9m4g5mmjnpje015v1m5eg603/zaxen.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/lovolanitojiv.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/kemobudagezusubapifun.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/darigevarivuramavit.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/98929314185.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa2266a256---10527285481.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_off0000e1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EA 20612 bytes
SHA-256: e4989e160e0042e776454709c9020b632e9d1d0a6576edc7f97aad77343bb687
font_02_sfnt_off00012f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F29 10836 bytes
SHA-256: ffb0e09d9b545137b300912de5e72f91ac032dd962b4a0d4287b145e0dedc854

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