Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90418207debbcf5…

MALICIOUS

PDF

76.6 KB Created: 2021-09-08 08:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a46ec90c2d9f806d958da4dbff8bc2dc SHA-1: 2e8971343ed367f83b79b5b4d6bfc2f1947c2269 SHA-256: c90418207debbcf5f263e26f2d8fbb7d712661a472f25d58683b1a8737df0693
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis suggest a malicious document designed to lure users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pnp-studio.com/fckeditorfiles/file/86511138890.pdf In PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/d0ad69807e053d44bffb96903a5b2cc4/81102294941.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/85c8b910854b3489097c46a2a671a7ca/jimeditiboketijegejoguweb.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/wubaposiwamezikepifetix.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2fc841bb4---gapexak.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/51240103675.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161059f26863eb---66893723701.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/3b004b79d50be8a2e7f9efb48c2194b1/84364960718.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/54430977927.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/remewarudekelizesapozadok.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/putegutejejatefalabaxom.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4513cb58b---87209317222.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1611adf9748a93---65305344339.pdfIn PDF document text
    • http://gchs1966.com/clients/2/2f/2f663f305105093038a7fc4b193dd8f8/File/65012007523.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/90113320179.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/nibalelakalatefiwewubedu.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca529ee8f7---koxal.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cdfec932a---mimuwumu.pdfIn PDF document text
    • http://fruitofthespiritcatering.com/clients/9/9e/9e5e3efd27976f294ade36eaf76108d7/File/kipoz.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/69834691020.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1dec0bf63e---23492696424.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/kubetuzaxofud.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/1059613955.pdfIn PDF document text
    • http://tulsacentral1963.com/clients/3/39/398188050227c7f1c8b3045a0a865105/File/vufajazavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=repetytorium+angielski+gramatyka+lingo+pdf+chomikujPDF link annotation
    • 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_off0000c100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC100 18828 bytes
SHA-256: 20d326d7619b152e66814be2ad436d6ea0d8ac64ae77e419a603747f95b58c5d
font_01_sfnt_off0000f0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 11548 bytes
SHA-256: 9368b0ec4485c4637b0d9230e905b417b887372b0464e94d8c1c9992b61e53ab
font_02_sfnt_off00010bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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