Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5b26d74418116c…

MALICIOUS

PDF

87.9 KB Created: 2021-08-07 07:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3caa8ae591cf1d8c863b353614bf6718 SHA-1: 4174e6daf421be50a29c44633977fbc2bd97e286 SHA-256: 0c5b26d74418116ce6ad4347274d5792bdec46e601738e42c4a3bb66bb3afb2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=what+is+the+point+of+a+jailbroken+fire+stick PDF link annotation
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e11dc8b702ea1f668141669140ce3506/65904942690.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/luwis.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/37082964583.pdfIn PDF document text
    • https://invest.pl/userfiles/file/71024817504.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/kigepamixum.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/83350427355.pdfIn PDF document text
    • https://susta.vn/userfiles/file/vujiberejititarosarete.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/moludijogukulijib.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/b3f2e3c2212769980cf614ab6abf64dd/xumobejugibevuj.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/5c5d8b6c9a09dd35d83c9e7f22936146/64482837081.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/voxivodamevo.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/nebr5oqt02cjh4i80fel2moies/92237052535.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/loterumexawu.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1609db59fdaa58---26045197715.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/dopubazikopefoliz.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa1f265db4---ramuxo.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/doniradobufubefenimi.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/85638581106.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/471dc0dbd512ee0e1a5a88dc5482eb40/fofebalodilaxudibepozut.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/0bfe71444f15b20831564245003a57f5/welifafelonutob.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/kiwemasasilumazotavedon.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/jolitufupuvarirobid.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/b84580eb4628687d3c973ff27ee6f037/rapiwaxugesadelofajobimon.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_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 10932 bytes
SHA-256: b51b688793624704cf02b21fdf545fb694765e907fe4fb92484f50dde2bea09b
font_01_sfnt_off00010d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12529 17280 bytes
SHA-256: b71f5566131b45d16645639e90ab54922300664b61d7173f4cae428213898280

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