Malicious PDF — malware analysis report

Static analysis result for SHA-256 53625f4ab1bc1cd5…

MALICIOUS

PDF

148.0 KB Created: 2021-06-27 23:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: b1b43ccf5562dc36041b9ac5f696fc6b SHA-1: ff1b6781c99368d290c5a60af81155db501904c1 SHA-256: 53625f4ab1bc1cd5c90ad8ff8d6b39ba83f1df8d8a711594136a6c6aaff7c609
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to compromised WordPress upload directories, suggesting a link farm used for distributing malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://smidgel.ru/uplcv?utm_term=the+spatial+midtown PDF link annotation
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d8002412c06---sifetobizenu.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b591ef4ecfe---6673975932.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8ba684ac2---82361114205.pdfIn PDF document text
    • https://juegosinflablesarizona.com/files/banisedutiwefukobutiwo.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090fbe535da4---votafuximola.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/havmfij09g66idu1fvu81lipd4/zufazurusi.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c534b8ecbd3---19614395545.pdfIn PDF document text
    • http://canvangdientu.com/images/file/37881830944.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/fidubezaxesudomupoterag.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/c101436999a532d85f76ec6c196fff4f/32457346360.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/pexizifepobas.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/febuwoxerevi.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a7d50c80d---4111852182.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092c79dbb8ba---64103126828.pdfIn PDF document text
    • https://sce.tw/uploads/files/60c24e0c547a5.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/jugozetiriwivimemegukaf.pdfIn PDF document text
    • http://18554080.com/userfiles/file/fogetuvozuvebipebopari.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/kh4r0jt2urfhugdo7lhoa0enna/65830372613.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3e7d4cddc---17127851604.pdfIn PDF document text
    • http://standardamulet.com/files/files/33443461458.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210527051445.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/tibijofikabazen.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/bc8f2af2048bb520b671850463c71c39/55920785672.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/0fa62e15009fa580763558e279990815/ridexipelabakuzus.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_off0001db6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB6E 21528 bytes
SHA-256: 9cb1fde9ab1f893df6c8a69270bd86795b3799fa4bd05c710e963dc7dd4d76f0
font_01_sfnt_off000210fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x210FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00022912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22912 10608 bytes
SHA-256: d22174b2465e7f68ec3a6eda3870941296d04c539f3e9465c591f3e011691aed

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