Malicious PDF — malware analysis report

Static analysis result for SHA-256 a365ed8b91e05118…

MALICIOUS

PDF

95.8 KB Created: 2021-08-16 15:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1f82f26f1b8ab1c4d87439dffc322958 SHA-1: 2b0da985a74cefd0e07ecf96bfe92217fb7f5913 SHA-256: a365ed8b91e0511861d791d2e519a7ddc5835d8baeac48fc48a72de42463a544
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://drafthe.ru/uplcv?utm_term=ejemplo+de+epilogo+de+un+cuento PDF link annotation
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles//files/kumiwubexadebi.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/5rd1rl5omafpgi5evd4amql0q1/43439541425.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/fe929280d0a5ce4ab7f300d10b843346/gudifepedemojuvuwo.pdfIn PDF document text
    • https://designclarf.it/file/nolinawipeliremu.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/vuviwemepowadokolumu.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/3876226078.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/du7edm8ueft9olao270cqum078/12665365705.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/ferujujolitok.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/muriwumebodijoxokijepof.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/damoxawuwisaxifub.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ea9c42a5b---32221332256.pdfIn PDF document text
    • http://fructusartis.com/i/File/90029815359.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/794d4579be09be6b78a302465d7c0fdc/27735728658.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fce446880e---xavilanujemad.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160adb390c7c43---pafivesen.pdfIn PDF document text
    • https://menu2uplus.com/images/file/51085863670.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f04d03a561---resuvu.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/badisojare.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/12530022091.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/nowulenaba.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16100d9a901e59---65563907375.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a31a9959a7f89ed425e7a962a9a25286/58177893013.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/608102594d0fc98be43d66773dcc18fe/mepezobevojod.pdfIn PDF document text
    • http://mobiliteit.nu/files/68359776172.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c01156620---6125856986.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_off00010e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E88 19500 bytes
SHA-256: 03d1b1ac814e17eaef51fdaee3709a38bf9d9f98d471b130fa30f4b9e47f48c3
font_01_sfnt_off00013faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000157c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C1 10640 bytes
SHA-256: 1873fd0c3b29b49ca474848b685cad9c4bd425549b744ec9b778a9df25cd4b76

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