Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b05b1de6c1fb32…

MALICIOUS

PDF

84.0 KB Created: 2021-07-04 15:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 900e807f2ee2c07cf93b1bebf5cc3060 SHA-1: 99508d33a07d5d0c4c2dfb2132330c07feadc1db SHA-256: 16b05b1de6c1fb32518182e039e44981d6968dddd13715662b79e6428ad72ec3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It functions as a link farm, presenting numerous URLs that point to potentially compromised websites. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://drafthe.ru/uplcv?utm_term=good+things+donuts PDF link annotation
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/u869tv5sppo1fomdn98up4881r/42346257850.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/13757348794.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/22d7a3d531a6fb7f41cf878ab7dbcbf0/53686010803.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/8oh706pa4oom0tb4pdogvnu307/gelapugurololexaran.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/ab0a80d25162ab4f13d8be46f1d2b365/wosewixibake.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/nonetefuzevap.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/1d66249a7b82e4c062b20b9a0fe2391f/ripavexuxesupeduve.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/19321015620.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/77277926303.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/7dd4b017e29318ce63f6a950c9e0e159/39457473032.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/44256406867.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c29b2069f84621c57b0a9fc64851adde/gufugupujizefizarudezizi.pdfIn PDF document text
    • https://kede.org/userfiles/file/82394974059.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/eefa4ec911c3c311e503a5a8ef176383/79221381038.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ca7c864f7---57251069636.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/lisimabikonudesowadi.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/velat.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/188da605f68d396f210a800a3566dcc3/mojaloboliriwatipis.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f44ac593c1---fetodarujumep.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab95745152d---91791462845.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/91962282361.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98B 10228 bytes
SHA-256: 37d9c2ceafa2e2e1e51870b76681f4dd2349d978cfa88585803cffecf4932f80
font_01_sfnt_off0001003a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001184c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184C 16624 bytes
SHA-256: 3b103bb7a57d05b1b554304c000076e1437cb6771508f2906a558e555f2e6174

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