Malicious PDF — malware analysis report

Static analysis result for SHA-256 916aa4f9770d3d4b…

MALICIOUS

PDF

86.7 KB Created: 2021-06-27 15:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 5f66b33cd36c47af1fec73473fc02f9b SHA-1: dfe7432451ac0f4b56b676e88b02ab8f1259bf88 SHA-256: 916aa4f9770d3d4b434b64e14f8dfad00b201b1828684badc87f13745f2b3f85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=name+for+a+large+book PDF link annotation
    • https://cafemocion.com/userfiles/file/bamosadelaw.pdfIn PDF document text
    • https://abeess.com/userfiles/file/mazatojarirapejurufusuj.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/jiuqvqq6el5gmcbpasbhlnb50i/46150542753.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/b148ec8d73fbc8ec5b607f6c39004a86/norew.pdfIn PDF document text
    • https://actor-conseil.com/files/file/rasobos.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9bf166ba---60324846912.pdfIn PDF document text
    • http://feast.to/upd_file/rimibemovikobeb.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/14378976256.pdfIn PDF document text
    • http://nature-revive.org/files/file/33106295038.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e141e69eb74a3f18466658230c563e3a/37261618487.pdfIn PDF document text
    • https://penal-garazh.ru/files/92041435812.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/23t9nnnb7qg5higlbkp5mfbnro/72275521125.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f34c1e412---mezuxuduv.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/17014029362.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9e37c8d1b---mafevapemofeviv.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/serapagofofu.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/ksp5fumtlvsk6udc29uftjb9di/44508464333.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/44210759810.pdfIn PDF document text
    • https://mollis.rs//files/32172466067.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/wavagebiwebabu.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608674a0e9ae6---koxar.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/kamabawujediku.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/98016592820.pdfIn PDF document text
    • https://edusfera.pl/upload/file/5852421638.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_off0000ef1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001072f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072F 18028 bytes
SHA-256: d015208eab0d72c5cc40b9ebb676d2ffbf7dc43f4aaf4c5717a4b10e2bbcab7c
font_02_sfnt_off0001364b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364B 10304 bytes
SHA-256: 756ceaa4223ac435af604aed2147c448002ff92b63de17e9b8ba4c72b9cc6d02

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