Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef2d97b9f0f8eac…

MALICIOUS

PDF

81.8 KB Created: 2021-06-30 03:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: eff93b2d1d60c0784bb79b951630680d SHA-1: 22e944d7b7e8708de05cea500f218131dba445c4 SHA-256: 4ef2d97b9f0f8eace9a8f92d37d8254c44bf19b508427ff695fb5d90d62c39fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URL distribution are indicative of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://budohurtsa.pl/userfiles/file/fegetejigutesafoma.pdf In PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071ef1baaa6b---18431944484.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/wufajag.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/165276025860c5778dc339a.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d6e4e12c7---18077500253.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/7099732481.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/901opbdkehierojeats0vnmgfm/67124800354.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/66946950882.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/079fec20666b4f13ce987d83c8e3a9a1/dazagojedamu.pdfIn PDF document text
    • http://slsnn.ru/content/files/74521239119.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021060402024913.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/disirosixi.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bddcb6dae3---38461635308.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/dafemuzatezagivubim.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/cb4273df6a020d5c44f65d1e84e23841/xebefotuwevowik.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b64a4e513ac---kasiposuwivupuludutiwunar.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/cc14fb1d1ac4e8778343dd9989545c6d/punitegaka.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4210b1e7da---81379235187.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bdd868c83---31975503925.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/a4bc0ec9726daac456801187cfeeac11/geruworogowerofisuw.pdfIn PDF document text
    • http://cucthongke.vn/userfiles/file///7913296217.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/bifegelo.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/xemuminubitujaraj.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/maxobojazi.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a45a7fb25af---nugisimipatuwivunaxebulod.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/efd2253b7e089c203b940acbcbbdcc1d/nojaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=integer+operations+color+by+numberPDF link annotation
    • 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_off0000db53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB53 17264 bytes
SHA-256: 26c75507c6509e24dae1b2cfb0be02de1ede0336fd036a59531a03f9af70a91f
font_01_sfnt_off00010877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10877 11020 bytes
SHA-256: 25fa4c8607f1c9db939b7156c3f0a99f93f21dc71244103a1e05e81ceaffe105
font_02_sfnt_off000121e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1