Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d25df3057825ab4…

MALICIOUS

PDF

137.6 KB Created: 2021-06-26 09:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 861c35f4bafd6f293ce9f901b5966ea5 SHA-1: 6171df717b4288948220fb6081ace0f8d6f194e3 SHA-256: 4d25df3057825ab42fa0e0f3b84304f52d5ee8797f9ec4cfec78e5e68e037694
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised CMS upload locations and disposable hosting sites. While no executable scripts were extracted, the presence of embedded URLs and the nature of the link farm suggest it is designed to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9799

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://valve-toho.com/userfiles/file/70285387667.pdf In PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160bf99404c8f8---pomarozik.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa5c3a292e---33345961513.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/brmtjcfl6386reh4imuvkj2vp9/gomitese.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/6f3421e95038fc22018c3a41b2707f12/26700140666.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/89971044049.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/dabogerigopufejipoxo.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/5f91c463ff099794593c8f7627caaa69/wikoterukabapesef.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4a07aaa09---33289894602.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983488c0bfa---69319617124.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/5f6c8afc319bd57876557dad1b75a515/25909012557.pdfIn PDF document text
    • http://webursitet.org/Files/file/popizirokurapadu.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/xilomomotowekurezunaz.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608486d395542---9150093046.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/61795900178.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/muvijutom.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee41b1079---1725536583.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097874be8242---25384452261.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/925e45bd3803b52aace0671147396667/78572004210.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/59254062782.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/kisimuzosebik.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a04148b3393---jigituwos.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/202mkmdae1uo9hl1gmofh2pert/kidefolabugaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=spend+time+to+doPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11659 17108 bytes
SHA-256: f82b6320281cd978baedb9e9822fcc23725c78229fa5fbbe4a92a79cc8441422
font_02_sfnt_off000142e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E3 10152 bytes
SHA-256: d62ab1262505a793de16040d5d6a6e6841574567e20af3e436fbee56842df202
font_03_sfnt_off00015984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15984 74864 bytes
SHA-256: e8e5a75510d5c44896e2c18aae3212f98024cfc020472c096f242f01f6a89dab

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