Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db79432d72fb5e0…

MALICIOUS

PDF

88.6 KB Created: 2021-07-01 20:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 4f2a573aefde47253fe8a0cfd8b5be64 SHA-1: 163ad2ceebfe578259189a7fe29fbe6be278d490 SHA-256: 6db79432d72fb5e016b09fc6372a0dc1680db02422bd6b3403cb8552462d2660
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or redirection scheme. The presence of external URIs and link farms on potentially compromised infrastructure are key indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/f1e817b5557c874682b36c38560873fa/paretopisadimulid.pdf In PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607da829b4870---31856467915.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/sr0lnrj26bh0nqpocrgf90cg0u/vamilekipafeduzugetezis.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/nejefunulokiwevikijuzerur.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b48db0f1b---wexuzekutujef.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/mepegifuradoguramepepa.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/1ulnjlhnhc7nfcuog3eov5iff0/71065843548.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/af6d341a5c830f3420a2c98c3ebd7bc6/nodumanuwigi.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/65753534959.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/0b461818e1f9c9633f523ea98d44640e/67422326931.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1339d370f---vapojuluga.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8411e5711---21332361092.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/2819126e19ccfdc49ae70c3c317b7e0d/ninidunilulotinorokegi.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e3be429f4---xixukozoxebemefexumudot.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8aaef7457c---5161827660.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zipopobunegituniduzilodu.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f2fbe5404---nawatenifidofisomuset.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097fb1c29a95---22992474119.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dd5dd6fbb---40827852525.pdfIn PDF document text
    • http://fitviewer.biz/files/file/damufomafifilaxafuziko.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c6f04f31e---99793582828.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/23820456227.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0b542caeb---33189856799.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/alj32srbpflrbu5oik4nct4o40/magepenikapetatotoxa.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/kuxavemisafobivezozubig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=chickpea+rice+pilafPDF 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_off0000f5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C9 10208 bytes
SHA-256: 461eaae0f7df17ce19160fa3b3d1ec93fbe6deef9ae14fe193fde91386c4e774
font_01_sfnt_off00010cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC7 18484 bytes
SHA-256: ca49d334c82757f91877e3f4fc9e4df57fd871022ecde6b318f5bf983ffae257
font_02_sfnt_off00013d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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