Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3da431e1c230f07…

MALICIOUS

PDF

84.7 KB Created: 2021-09-05 14:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bf2aaf7840d04459df745ec036a028f4 SHA-1: 82fce338e8c4866541da4dbdd6727035a7ddc1c9 SHA-256: c3da431e1c230f07d422d04fec16c70d518601fb747ba6097f6f58b166c70fbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of embedded URLs indicate it is likely used as a lure, potentially for phishing or to download further malware, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://cructi.ru/uplcv?utm_term=clinical+cases+uncovered+surgery+pdf+download PDF link annotation
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/555ee4e8e4946d38645425e97a6714d1/20902151916.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/kevavidazolosivoso.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfad283d5d---pagalelufaxerobubafowar.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b379aaa818a07ef2ab7141b79794ddeb/mitotoxij.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/3082801185.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1ua2mlpvlr1irdev20gsb886q3/31967285578.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/kedanozirikuxulusud.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-7/file/gokiwidadosuwaxaw.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/mobozizopenezep.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210505163445577.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/zofixojameb.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/33181724036.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/90447899033.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16085dc2cb0811---37551364296.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b7a2ce989---norogaxakitabeguxa.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/7685e2b7172778253b3b0f53fac85d61/98637379640.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/jevafal.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/vck2trb2th121b1nbe3336j1r1/tilefisod.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f49600937a0---12537883429.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/lefppb4c364m5e3u0cq7u3h586/77185582819.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021681818576842.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160757164570b3---piloxuwurezeratedusawojil.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/raketujizumujew.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210716013511190141u1y41c.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd4eb70a8a---vekokazepivixasuzixewol.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/suvulef.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_off0000e2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 11096 bytes
SHA-256: da281fa2b442fb12ae2dfe1ac53c10765c9958386183e285e118ef007d69e62a
font_02_sfnt_off000114aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AA 18388 bytes
SHA-256: 712670c3d526bf328b208ac421b8e6d360ba539d643aa1cfae8e28b02771c3ed

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