Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e0e98f21520d4b…

MALICIOUS

PDF

79.6 KB Created: 2021-09-22 10:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5756765052d4f779a2b1045f74d13e78 SHA-1: 6a9e74fc7a51d7c49bae1784935740e9f12381f5 SHA-256: 88e0e98f21520d4bbfea619430576168874f2bfda0b7edc6bb870b4ee45d08b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with SEO spam or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=gta+san+andreas+jetpack+cheat+pc PDF link annotation
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135568e2f373---bitudagasititodurez.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/fulibusafowapupoxo.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/86718741822.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/zofumuzodadowoxinipilu.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/93862390475.pdfIn PDF document text
    • http://orderkai.com/uploads/files/76705498767.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/vofikonuzawajiri.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/febal.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/80271008565.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210903_015151.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/86494796184.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161463a8cc2442---magulojomanogakex.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614059610329f---toxasikafibalibamufijo.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/53422846808.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210903_131720.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090900473448.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/38575452690.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/xegoxerezovupana.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/76579547356.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/65721324546.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16141c5eb5b39b---gatobiwu.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/59bbc63181a9c6b6b3f7d02a0e1143a9/muwogixobedaguledufiriwok.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/07e75e17c10e2148a4693f9f761eb384/85082391660.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/tuwaxajepepokevusojogape.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_off0000d20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 17864 bytes
SHA-256: 96a6a090fc642530f58a8b90ed0c043d36b68316dea53420063beaa7c5e20e4a
font_02_sfnt_off000118ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AB 10612 bytes
SHA-256: 025533dfdb6dde56f2c638451640b968c67dd75fec3c8969b915d493e9e52b17

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