Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29cdb721855e271…

MALICIOUS

PDF

127.5 KB Created: 2021-07-01 18:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 4591520a13c7b47ba885396fd453ad5c SHA-1: 5305bae353b9714b9ebbac9fd30e018560571d30 SHA-256: c29cdb721855e271b1abbb3f9eed0f070d1de3e5f34f0c831f311be507cfa5f1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/hbco9h6o4drgiao4j6suldb7j4/dafabonivikaluw.pdf In PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/5fe91f09597e9b87450c5811084d4317/davelavebezemowikopiz.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/zafozepa.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4bb5a3cc6---ximiduji.pdfIn PDF document text
    • https://mahae.hu/files/files/42900495016.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/bokojav.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607204575fefb---voxukodoruvanik.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c3e9aac1d---kemapawesamuxebaduwani.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/kigixuvafelazuxugiviril.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/16f4d832b371322c99c5e31ac7baae61/xobezikefele.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070361af0e3d---82402912564.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/3477a5d686a52eee93e37dd9ef0ed400/zefid.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e6979882d---pupolunusarokivuge.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbc47ee01a---jesaxedirevop.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/74746801303.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/30003857115.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/mogizekolukuvudomiximuw.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/18940359181.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/30837144335.pdfIn PDF document text
    • http://msiutilities.biz/documents/nefewesisegasol.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e3536f1d1---dijeze.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/624c9623d98573c2100a27dba180ccd9/redesuv.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/diremarajebati.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/pemegidaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=write+a+paragraph+on+pollutionPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E18 18932 bytes
SHA-256: df58759394bfc682ab21f6c5b903bc629fb41fabdd044dae3f00fdca5fcadc9c
font_01_sfnt_off0001c051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C051 10456 bytes
SHA-256: 6d0c572db17252eceb112d95fff5a1437b190a978a271f02e09d1ad76aae1caa
font_02_sfnt_off0001d7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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