Malicious PDF — malware analysis report

Static analysis result for SHA-256 974f3a604925abae…

MALICIOUS

PDF

76.9 KB Created: 2021-09-01 04:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 77538c7235f033048ceebb855adbc0d7 SHA-1: 17dbf20481f8c80507d5116522f7b91bf23a335f SHA-256: 974f3a604925abae8821dc182f9d019df64cb0d3f20c4b33c27a5ddd08b8f305
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to lure users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=signs+and+symptoms+of+kidney+disease PDF link annotation
    • http://banglatalkies.com/dynamic-images/cms/file/81014562418.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/68363640746.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/zowosulalajabisimolazopuz.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28038e7713---wememoninotufiriz.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/safavasumulikob.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/modililib.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b281639428a---nupizaratedovojej.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/gimapasefoviwipaxire.pdfIn PDF document text
    • http://bulmarconsult.com/files/50017324562.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/61297a3353733d964d2eb47e859d46b8/40805291868.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/68880189040.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/sotidawaregowasekad.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6d7c8c0da---89778254594.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070b06ba66f1---2617401490.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/55540609027.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/bijidopupumifakobame.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/952a1495db6ccd993d3df2cec70c8ee2/60599848185.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c60c8aba5cceec16bb11542e19bae70f/nituzapawemaxefomudaba.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/29628964141.pdfIn PDF document text
    • http://rahwayhigh.com/clients/42761/File/togoxawevusasek.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/remob.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/48310867489.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/giganitibamibi.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a521f8f30d4---nexugibofodudatirofolewu.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b5396b778---kodof.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_off0000c9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FB 10976 bytes
SHA-256: d41df3a4b702e9af0f7ab73e58824bacc8c5dae03ad739d01fa80c61987bb507
font_01_sfnt_off0000e345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE345 16720 bytes
SHA-256: 86bfe7773834babcd78dea6821e803c882a6a158b19bf68571075925bd2729b8
font_02_sfnt_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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