Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a47a0cb858c0cd5…

MALICIOUS

PDF

91.5 KB Created: 2021-06-29 00:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 0278c87d7553bc5ea6e54c274d81a4be SHA-1: 266e2578ddb3f705ade4d051d5bedc05542a4088 SHA-256: 5a47a0cb858c0cd5cefc8e0812b2d853f49723436e8503f742a5ecd1c2316827
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple distinct hosts, many of which are likely compromised or disposable, suggesting an attempt to distribute malware or facilitate phishing. The presence of external URIs and a link farm on potentially compromised CMS upload storage indicates a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/34442206325.pdf In PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607278cc45004---10273427088.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/85764591021.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919f69a9d52---85549025737.pdfIn PDF document text
    • http://drironcat.com/images/file/vutuma.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3131f3517---zatuxareruvulo.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbb7e27d46---59588026365.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/61425748668.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/muzesozixesaguwakil.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc73f1ae894---88716242965.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef63868536---35499055335.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/95613444450.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ogosulow.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2e6b7b80a---64805211261.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051623090373499.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/kutpr94jag0kju4oil3t0a6gfh/rapirosilonig.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/42573255216.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/lubafizogukukadula.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/pfgp9o0rbri5j1kebihspu0p92/93779129695.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/m3kjj0lmfu1agu2hcecn91fmb0/lobalelikadif.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b483cf961dc---83984477736.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f282daeae5---23713287547.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bb5c78c3b---papezasawanaxumivifu.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c9c6f4159---velikakesanole.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/n260v8fadod10qjrm00sh4e829/10504345352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=righteousness+meaning+biblePDF 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_off000105c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD8 16488 bytes
SHA-256: 56f41c51d0c5413c5f809fa0e960e3a7be634199357afc00f233593930f2577a
font_02_sfnt_off00014870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14870 10740 bytes
SHA-256: c0b5a33c23510eb08a955ac4a196f16844e575d33ccde0625db04f102fad3400