Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c2d00ef78743e56…

MALICIOUS

PDF

91.1 KB Created: 2021-08-10 04:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4f23705bff9e5b098500004267979f76 SHA-1: d4879fb461406b2e5aa1a602ba162da5f1242864 SHA-256: 9c2d00ef78743e56d8d03c93ed97bcdfa8ae7442fc4017698e4d6040048fad2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this, indicating the PDF's primary function is to act as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://queure.ru/uplcv?utm_term=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D1%83%D1%87%D0%B5%D0%B1%D0%BD%D0%B8%D0%BA+%D0%B8%D1%81%D1%82%D0%BE%D1%80%D0%B8%D1%8F+%D1%80%D0%BE%D1%81%D1%81%D0%B8%D0%B8+8+%D0%BA%D0%BB%D0%B0%D1%81%D1%81+%D1%82%D0%BE%D1%80%D0%BA%D1%83%D0%BD%D0%BE%D0%B2%D0%B0 PDF link annotation
    • http://duszek-lasu.pl/userfiles/file/dobubuxiwafulizanubuju.pdfIn PDF document text
    • https://music-group-store.com/upload/files/91780564997.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/63671711487.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/h0cg0t876nor0hc2qbugidqgp2/42334571115.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/fodadimakunadero.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/wawulera.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/ea1caac9ed53646fe0e07f84e710b225/moresewomujebotozibijob.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/bifonetudiw.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/jofanerixajodarilebadote.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/c485db3c9429758da3cb84e7eba24816/kifuzatikinazobojedimedax.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/mslbcc7emkic4b10f9o9grsvee/nezov.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610cf43a6288e---48137101221.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807f1d5022a---87620176550.pdfIn PDF document text
    • https://lemanssrl.it/file/66673694132.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/09596e3542ac37b94efbee33f4b5e727/najewi.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/8bc23d0ad6d252c86a9516adfeb850e5/xotizugomonutavo.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/jigipif.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/96256201624.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bb1f4abcf---gofatuxalati.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d403a1d63766d08f979f528e28b04b77/mifojexisiwawetotuw.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81e88ce99f---14213733914.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/libina.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_off0000efc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC1 22348 bytes
SHA-256: 7543909b641d53ec17889069bf69b3ef86df606072cc46a56f8c900495d7eae3
font_01_sfnt_off0001281e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14035 11200 bytes
SHA-256: 294daefc91c3575a782fe52b82718aa885c3d4c559b4328a513f669f8e3955d0

Open this report in the interactive analyzer, or submit your own file for analysis.