Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b548365d6a41be1…

MALICIOUS

PDF

94.4 KB Created: 2021-07-28 04:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 9411aa7d5d243ec1316022ccac46b793 SHA-1: 677cfd93be10f01e2efcbf4ba32acf3c3f5437f1 SHA-256: 4b548365d6a41be1871d1168df01e4126fb6291d1a9cc66cc5fe6b67c0c03293
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress installations, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/qajnabpjmdpqo42ddp7ld2vla7/12645116245.pdf In PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb34aa11ad---webugunatogabuzukeram.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/pojodirumofobux.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b086e7344---sefano.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d29a03974---kodemigenepag.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/jerejesokabol.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/15726741191.pdfIn PDF document text
    • http://uniquestatues.com/clients/9/91/91c6e204ee4529d3b478b0717040545d/File/51174697723.pdfIn PDF document text
    • http://dnepropress.net/files/file/namuvuxoperi.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/37275627451.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/renakes.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/gme2ehts24d6r90f28b48qs4v2/70415072790.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/tpsuk2onsueqecvjm0ivud79ak/96942452085.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/bibumo.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/78631527158.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/de68cbf25988ded7fa205623fa075455/belit.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/lonolatixojisobeletamanu.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/db0ecb78893f12e7a7db741b949012de/97792925339.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021052809081573499.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/gubq33oq0plu1o2c2mde8fubr1/lowajaxalum.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83588e070f---sunorawaximonodox.pdfIn PDF document text
    • https://jagominum.com/contents//files/ruxexufipofediregemutes.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607606d062139---47236965670.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/wufibujujafutobalomefefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+hack+block+city+wars+2018PDF 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_off0000f4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 18056 bytes
SHA-256: 772ae03fcedabc7eea1c231f994ae3f060a3b2095a5f34ee32bad73ba0d2b48a
font_01_sfnt_off000123c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C8 16108 bytes
SHA-256: ee1847d0e0a7b1320fa7b16c095c4a9e2a347c36fa4ba5287f390873cc2cb3b7
font_02_sfnt_off00013916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001512d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512D 11016 bytes
SHA-256: b2426204b888b9cec8a1be3ee828153494397b22a420425e2556592c0ded1ada