Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b05b8cf1d75b9ab…

MALICIOUS

PDF

73.4 KB Created: 2021-09-07 03:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d0f95549a9adf2aefafd5be85755c845 SHA-1: a1043547fccb0ff6c636e1e70597bb059b705745 SHA-256: 6b05b8cf1d75b9abf857068ed7394e14d95d56d6f285f80d294cc75ca818126f
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 as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs and links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The presence of these links indicates an attempt to redirect the user to malicious content, likely exploiting a PDF vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=mathematics+olympiad+questions+for+class+7+pdf PDF link annotation
    • https://yptea.com/data/fckeditor/files/telujoperuj.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16094052679478---simikobaduvaxabixegeli.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f6aafcf30ec---44167067662.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/59598738545.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/jidemaporebopinog.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/12010361913.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/xivekuledegudufunobe.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/darasekifoje.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/77f2caf072aaaa5d59dd187351f3fcda/rururunoxawepebisigikof.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/benabutigazajulomo.pdfIn PDF document text
    • http://trekkingsapatours.com/upload/files/127208294.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/dilubobeg.pdfIn PDF document text
    • http://keramann.ru/uploads/files/3084636674.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/3973928135.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/75b373ac93e0da8966404d7476e5e1f8/41501346658.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/12566750741.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/badomabidusabubu.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/47356211884.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/945ce068bd933da9aafbd641362bd0ff/92718960524.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/48b2cd7d4e7b030e1b2a8c49dffd1a1c/dibuboxiwusabovetuvesa.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/024275c0c0612733e12906cbd2d9d9aa/kazodusadenetisuzevariwu.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/tidepuzewavezinepiji.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/kebojokokimupanawagawupig.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_off0000ba30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA30 11288 bytes
SHA-256: f01c963e683ec80b9d78df2a6828bfc8306b08e7073de96ea98ad06a1a7be4f1
font_01_sfnt_off0000d464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 17000 bytes
SHA-256: f1fc51e7d212109ae8419f79ac2191d1eeaf9b9eadf455a963b6d6d12a77999e

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