Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4428308ca3ecff…

MALICIOUS

PDF

73.2 KB Created: 2021-07-06 12:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8743bfd4c46689f13ef834269ae04f6b SHA-1: 0e0e1b19a7b92c050e2d757a9fdaf7dc5e11f966 SHA-256: fc4428308ca3ecff70d39ae6f47d1c1cedf912266f0ae1ba36ee6730cb8f8993
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be redirecting users to external malicious sites, likely for phishing or malware distribution, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://allytemp.ru/uplcv?utm_term=kordramas+the+legend+of+the+blue+sea PDF link annotation
    • https://canionglobal.com/FCKeditor/file/zizaf.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/bb632b5a6dc6bc4fceb162f4a879a92d/19705238231.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/c8f755e4560732fe3f7d0080c782c9bb/60329701987.pdfIn PDF document text
    • http://ipceurope.com/assets/file/juwivixenaleba.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-26/20210526033112240608.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/66164306acdfe772c10a843b36dd01ef/patiroj.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607617fd062db---monajanur.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c55774c9b3---sulogesugir.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/6fa88efad57f89e37908beaca842fc34/48254099507.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace2df7328b---zonabanepapenigox.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/numanagojiba.pdfIn PDF document text
    • https://nattasampun.com/upload/files/54766157450.pdfIn PDF document text
    • https://paperland.bg/uploads/file/zefapidonul.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/c7fc064ed2d63507f889d29d325ff41d/natukuve.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/3qjddpcl26ke6e9bfmc26cja81/bowibewotakezajepapil.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd0b55111a---lipoxipotujeguzopazekame.pdfIn PDF document text
    • http://jucal.es/images/file/puvufepatumigevuximu.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/sixanalalalusetavokeg.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/d5a694538a9e47bcc4cfd7a154880299/5088345631.pdfIn PDF document text
    • http://asustainable.com/global/file/rupegimuxulowevemexu.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///dasiranavule.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c113ef981---nakager.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_off0000bb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD346 10940 bytes
SHA-256: d192b09a48e95777af53127f0065bec9b40761b4ecdd7821c4a551e92e7575cd
font_02_sfnt_off0000ec3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 16648 bytes
SHA-256: 77be12c486ab2aab5aa16eb02c45e0ced6dab89458ae9a0abfc878729f472d7d

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