Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a2a8503371cebc…

MALICIOUS

PDF

82.6 KB Created: 2021-09-24 03:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c4bab737790fb6c60fbe4c4a0f39bb94 SHA-1: 58413a263c884b114f103b320a292f8be79c3ef3 SHA-256: 70a2a8503371cebc2d6d7e0789cdeab0af8e4c1588876e9632edaaa61b6c7ffb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://cructi.ru/uplcv?utm_term=brawl+stars+30.231 PDF link annotation
    • https://profesa.net/userFilesfile/jetifojip.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b366dd0dec41d7173eeac7abce1e8fc8/69304470017.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/fafulalugejujedajejos.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/bqeui7t6k31fpso3p5sk24g163/53085823679.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/30395832644.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/nezafutubomurenodukoxidiz.pdfIn PDF document text
    • http://skupka23.ru/upload/m/59365213926.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/35046973750.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/wagovagovalij.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210919100635.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/92686508175.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16131134f7eeec---77193284665.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/bexotiz.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/84314535179.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/ratubulomobuxo.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/forodumuxigedufidibawuso.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/52568751374.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/rabezaboraxarorifawofo.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/97562442573.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161361513e6027---topalasakajesuvizovesuna.pdfIn PDF document text
    • http://apnm.indexint.net/ckfinder/userfiles/files/fetojoxavovorugirajebibud.pdfIn PDF document text
    • https://digireg.com/upload/12018304593.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210902130159.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_off0000baae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BF 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137
font_02_sfnt_off0000e837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE837 10324 bytes
SHA-256: 059541cf54bc62178ebeb2d8cb5eb84bd72a7fc604735011d5acb67651d9b8ce
font_03_sfnt_off0000ffdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDD 23852 bytes
SHA-256: 7c3e4296ecfe0277e362bda18d22e58ab29687b97f8825af23a5e36cef8d5fc2

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