Malicious PDF — malware analysis report

Static analysis result for SHA-256 058f274f8f8b1e7d…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 22:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 054854a43fa63a16e52aaa0690e33949 SHA-1: 3605f07cf73a5b39d45b1a45e82067edc87abdb3 SHA-256: 058f274f8f8b1e7d3b0d4703fada942b6cd422f17e4b5aa577735b1b126ae587
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=20000+to+30000+mobile+phone+in+sri+lanka PDF link annotation
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed8654dde7---supemorakibo.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/41123428844.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b18a8c224f---71977056953.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/96960101372.pdfIn PDF document text
    • https://msiutilities.net/documents/bumatixunesupam.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/241822967.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/61549733055.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d4cdf2d053---pupido.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/viwemab.pdfIn PDF document text
    • http://neuroxl.com/images/file/funetupa.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/22877736234.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/44967567615.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/97843430550.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/sijagezivadodemok.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/21676332474.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/39878304976.pdfIn PDF document text
    • http://rivucota.com/upload/files/zutupegifanakajufavasewun.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/rozikilasedidipoba.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/44939769292.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/htq748edguf5amortcidohpci2/ketepukuwolefibi.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/47833145991.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/51021181776.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/49617905142.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/xasaz.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/risiso.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_off0000af67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC779 15328 bytes
SHA-256: 4f1a5f469390495d529ac1589d3f50e46d346fbc6be6fe389a0b2cf4c6361caa
font_02_sfnt_off0000ee59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 11064 bytes
SHA-256: cf9acb9baf0a169a93c537e220b80897a53f9e91a4b1c7c7efb8e52da991ed33

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