Malicious PDF — malware analysis report

Static analysis result for SHA-256 65bdc9e86abab65b…

MALICIOUS

PDF

173.6 KB Created: 2021-07-29 23:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 6d648148e8f0f3840208468a708821de SHA-1: 1dd775f87d5e1e2f39c0a2f679b57e8d3404087c SHA-256: 65bdc9e86abab65b6431b923151f6cdb9fa067c8e59a4a753229116196802d37
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggest it functions as a link farm. The primary goal appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aplusadvance.com/naver_editor/data/file/32173484133.pdf In PDF document text
    • https://b2cexpressdemo.com/userfiles/file/wufukupolesumul.pdfIn PDF document text
    • http://jaatkinson.com/userimages/bisugolefebafukeborigew.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/83d80c30025f0b20be06e40951a3175e/wabanifemomipaterekopa.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c01eaa00a0---88536512782.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/651bbd14828efc1c1e08c7c7ab20c310/wonexenotoxamelif.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/8844851449.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/verunolilujajurunoxo.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/bhqi8aiefccen4t9kba78nm9k4/dekojileduloburaxewuwirig.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f29dac23c9---gisosevepunune.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/38561408514.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/46153815456.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bb9152a88---80912354373.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/fovopepafid.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/mibusesisaw.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/fisuku.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f6b333a8838---68818211071.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/c07ebb0a88246b1f252d837df93fd6b1/dexoxubajipotoxar.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/21886658988.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/66155085013.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d763cf36ca---kewamosupogomokilujur.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/447b58c2d3da33138d1d9ccf3e295ffa/68150650740.pdfIn PDF document text
    • http://polletnv.be/uploads/files/75291955137.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6934ddb00---44613706783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=tokyo+ghoul+do+kaneki+and+touka+get+togetherPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D59 10628 bytes
SHA-256: 03f1840375694af5163217752ee9b0843e02fca5678a058cc73b6b94c1bf44b7
font_01_sfnt_off00016564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16564 18880 bytes
SHA-256: 2c6e025de007984c532d81ac320114030c3bc0371cab74a25cce24a5094e4993
font_02_sfnt_off000195e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195E5 95864 bytes
SHA-256: 65e97e8ca0880977292f7c708cf564fc4095ec00e199f1e9d6b867bb833a0865
font_03_sfnt_off00028d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28D8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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