Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0aba1a61c201497…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 15:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5a14ebc5dcbfd6e3dd9c351e9e324b61 SHA-1: 546ea834c39fb5e485748554b6f18fd9c8bb721e SHA-256: e0aba1a61c20149775c7a9c1fae55ed88366ba87da500e02960df45212aa96b0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised or disposable domains, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and the overall structure point towards a malicious link farm designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://catamma.ru/uplcv?utm_term=rotate+pdf+insert+in+word PDF link annotation
    • http://dakmet.pl/upload/71775594975.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/sijamumizeziduninusegelid.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/bojivopojuralokixot.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/gusopejetokadiva.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/jaseru.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/23747692101.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/kitumirutetojepubok.pdfIn PDF document text
    • https://kiameds.com/images/upload/files/18636282981.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/avvgaotarsfamsu2dq2pdclclo/soxisaxebemutumewefilam.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/84602989430.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/44247521628.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/79536652241.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/dblqshs9sige9gtndp5ahj3bf3/galafologijut.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8b5988683---kujidasegovoxarofoke.pdfIn PDF document text
    • http://sam-global.info/files/file/26757360565.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/99259018212.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/wagotev.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc7a9a140c---gutobodedovowatiwiro.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/nogexogixamapanoxapawutu.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/wakilodixuzozerur.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/duposulizusugos.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/55879151411.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/delel.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/53655247893.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/738chmbua0c3mj25jcn348b7kl/lepozufimikonavisepim.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/kipozipapememafatolag.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_off0000d5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E6 17916 bytes
SHA-256: e9296f2bd0f04e46c7b284520566ad2b0c64f63123919bdcfbc1748d08194afc
font_01_sfnt_off0001045b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C72 10576 bytes
SHA-256: a7d9686eae0f0c59066f25998e5154c9c549391be2388aae2bac8a9d5de4e80c

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