Malicious PDF — malware analysis report

Static analysis result for SHA-256 99823d6152aef0ed…

MALICIOUS

PDF

103.3 KB Created: 2021-07-01 00:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: f3eba9ba4808eac52eab84024b0d32c0 SHA-1: 124c9db3159e85c6de5113a07ef7da6e8eeaa635 SHA-256: 99823d6152aef0edb76fc87f9731c6ba45f28b3a856e6425e1c3f80b965931e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used to distribute further malicious content or phish users. The presence of embedded JavaScript, though not fully analyzed here, likely contributes to the redirection or obfuscation of the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://cructi.ru/uplcv?utm_term=planet+coaster+challenge+mode+guide PDF link annotation
    • http://duhochmis.com/files/uploaded/files/81272345841.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/828ff14c00e27120aaec13ef32ba5f93/90011567534.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f72bf2364---rariwuworevosijoz.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a26f2c89cf---64610071392.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/92177968811.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/db366251f648cf54b615386718e9f008/75888159738.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/75095089731.pdfIn PDF document text
    • http://nessium.net/userfiles/file/tasazugisasusizidoxo.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210628050129.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d7aa93a656b---vajodukixo.pdfIn PDF document text
    • https://agenziadiviaggiocagliari.it/file/pezusukopuzilomu.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6af50d101b---nakasodedomuro.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff4643284e---notuwuzupovarugawirujura.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/7220bda7af3423da06da0755727ce7ee/17338064259.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092abd89dde8---1453017258.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/4184ed8fff2b94a0e2b29624f0738345/93927692090.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/30763957965.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/dcb4bbe2f566209afb384cbd0745a2c8/rukoritusikimokab.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4dfe1443e---lanupevagiru.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/52595840966.pdfIn PDF document text
    • https://rotherelectric.com/files/xekip.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/870e267ead67720b13383e02d6131422/wowiwomabofixur.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/56816720041.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/ec81f20086595bb7e9fd10e28eabf7aa/nefirunedawuvujeturu.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe6477e2a9---51108888531.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/06468cbde68e1c29052e97340832461b/14487295034.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_off00012ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14700 10920 bytes
SHA-256: e6d74490c0599f458129216e2316253a7924014b7127221bf924468f42a9e22b
font_02_sfnt_off00015fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FE5 18220 bytes
SHA-256: 56bf8850bc4354d86a522d8d3a34a87e147b553c86a6e3be7f4007a3d1869f20

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