Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf830d2f90a68a2a…

MALICIOUS

PDF

74.0 KB Created: 2021-06-26 02:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: adbf8b0af1480b008bdb3e2a763c2239 SHA-1: 536960aad3e03d6e5e7f69a842f5955b23f9c9a1 SHA-256: cf830d2f90a68a2aa1fece7597b449dc9dc180efc6ef85d177daef07f8cdcc78
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these linked sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drrajanmahtani.com/userfiles/files/binadekojobopu.pdf In PDF document text
    • http://amuseonline.com/absite/userfiles/file/96034665280.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e26802cd52---diluzijazorubukono.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/zigap.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/93f21298c80046d869e6935ebced85d0/puxivamuj.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da42449f5d---5347574386.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/4fc1208581cf1f72be253f85190a87ac/ladusamegajivoki.pdfIn PDF document text
    • http://farashimirooz.com/files/libikevofezeninurirekivas.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/724dc5d728cc5532d30cea486d2ff5f9/tejosetiwet.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/dulinekiponebim.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/63880783408.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/fe6e6a1afc2cc581e5e7f9bbff7e2caa/gosodisumesomima.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///20216231745461686.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/97792204236.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/2945675644.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/76416886347.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a98f3d5bb53---mifobusirifowowukolefumub.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a55a387c5---33638888751.pdfIn PDF document text
    • https://termofriz.rs//files/13432415751.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4775b58eb6---77094969255.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093f3eb8938a---wuvurutadep.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/7hrg4epdvlt7ub5kqpv2g64f4f/61494647527.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda3a1ef4be---xinabekixutezokinaxuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=atomic+structure+and+theory+worksheet+answersPDF 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_off0000bb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6F 18452 bytes
SHA-256: 460c4811681cf30b8abad7df98401be0152bf0b694064722e5b227de7bfaa029
font_01_sfnt_off0000e9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C6 10960 bytes
SHA-256: b8377dd3fe824f952d194dce6efd8ea7091ec4159db85d4b7ce00afd925f994f
font_02_sfnt_off00010321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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