Malicious PDF — malware analysis report

Static analysis result for SHA-256 4927b1cb0fd54a6e…

MALICIOUS

PDF

79.7 KB Created: 2021-07-02 19:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: de02a29c02af41e93635946d8265c96e SHA-1: 8cea3d0da5f576a77ff7d1cf040f285ca1bde664 SHA-256: 4927b1cb0fd54a6e1de5b1b22fe0f7817877353c0236ab97a1b647a13ca86134
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The file's structure and embedded URLs indicate it is likely part of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crewmak.ru/uplcv?utm_term=pdf+page+joiner+online PDF link annotation
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc01061fac---66413141398.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f680c97e5f---fomanuvelelipus.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/02e50cc2563598b324d1b3f56eb84f51/wubajopulurufusur.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/6aa49cc814248348a9e5c062f7752aab/dubibebeve.pdfIn PDF document text
    • http://amandamaitland.com/images/file/golasekeg.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/38441454685.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/7ec8101d787d16c8083bf327330205d3/29003771221.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf62a27973---nisutag.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/73c62b8aeae85d4107757e53e382d14b/zopijubag.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/noparukuwuralidete.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a36294466a44a8d24deed39fa7a1c8bb/16251824813.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076f2d8c5279---nezipujenugegesapewepi.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/766fd84c514fdb3137bc4ea752933f56/2087948649.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/sinaxo.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/6469d49f27b7016629f017398b1920c8/82504640843.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/xodamizorofefudutu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nijedigevimewiv.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/peniko.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609602b5f31b4---fejotowalarasixudojuxijid.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc80b2cc47---95005518814.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bead82b5200---45339151181.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b18b6b863da82eb361bc3f1d834d09a1/mewuwobijobopasi.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_off0000d68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68B 16728 bytes
SHA-256: aa476f57043aa50cf6c86f51045ca7d41126fb8df8e77e3b8989856712f35087
font_01_sfnt_off000101f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0F 10536 bytes
SHA-256: 7bfb064198473aab24153c9146543f67f8f712379613f59935f74dba9102c6f6

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