Malicious PDF — malware analysis report

Static analysis result for SHA-256 396dffefa3ceb40b…

MALICIOUS

PDF

82.4 KB Created: 2021-06-27 11:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 6ef1ca4b0a84388dd98dfe7e5fb12672 SHA-1: 5deb53494ad2544420ecbbb93c81903c30c5415b SHA-256: 396dffefa3ceb40b67ec0c1331751bc59b8a771934969dacf2dded2acb9d98f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using these sites to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://nomylo.ru/uplcv?utm_term=physiology+linda+costanzo+5th+edition+pdf PDF link annotation
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/9c1d491ef46a22198f0fc08d706bb2a3/81493403842.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kunekoluz.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/dd00deb97117b9ed3badc74c945f6975/fedapinigubogujekejarovut.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/d63118a7b1fb42fa04c95b0e3a8324e5/28556888883.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/656ed88bbaee83ffbc0274a70cc24285/87246016438.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c48ed0d760---51720884098.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c63cf58446c---12603032609.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/30577708868.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/babuxaxozotigukaginawo.pdfIn PDF document text
    • http://arslanemlak.come/file/40744874966.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/54360456413.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/mh0dpujg8dj8vc2h5lgc22ijei/busuzudegumireb.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/guveberitalamazet.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aae12a513b8---betuwa.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874683817af---3955049114.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/e6ca59146f5ae75547b0574bee92cea6/15027213682.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/13226717216.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f43fcef9d988fa38fb9191a1e86223db/78988361820.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/leruxujaluwawagas.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/hu050e58jofaon8pccvl20guc1/seburusapasewosalig.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6255a271b---nugalizuxa.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/43940884725.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160928bdfa12e3---80331140309.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/9e161871d6ea1ce7ffa49b0ba3d5d2db/72204080930.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/rulefuxopetizujelenat.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/16895143216.pdfIn PDF document text
    • 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_off0000c388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9F 11108 bytes
SHA-256: bf432f238f5086ddfc1174a255cbcaee793d7fcc9d2146544aec61941cf54af0
font_02_sfnt_off0000f55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 16396 bytes
SHA-256: 8b9d44cb6b07fc9341e4a3e3de42c762081391142c7f7347832b51dd18836f61
font_03_sfnt_off00010ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA3 18464 bytes
SHA-256: fbbb9938d6d520b2b03c3ef62c1a90714abc45f22650cbf520918925495cdaa5

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