Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce811a9463f5b062…

MALICIOUS

PDF

96.1 KB Created: 2021-06-30 23:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2d9096061e65d978172f29b1492c2238 SHA-1: a582328ee9a25fd8b4ada2b500e5c7e10b67b50e SHA-256: ce811a9463f5b062d258d69c7b00b6285c79cacdf59eac3c6585cea9ac904ee2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear textual content, but the heuristic findings confirm the presence of a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://archism.ru/uplcv?utm_term=either+or+proposition PDF link annotation
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/o4itsh9fatl7fjeutpgreamrj3/bodilegiline.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/e508727ff96a5c8a12ee7a2fd88f38ad/976535707.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/39666e3dd1d3e8af07ca3fe46c62ff0a/rebekagawi.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c31d1901675---jagutegojazosu.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/xakunopuwigezu.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/26753869310.pdfIn PDF document text
    • http://iwishop.hu/file/23116315413.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/3047c7dbad04d8280ed1135d134bf0b4/naledazusolize.pdfIn PDF document text
    • http://www.asslar.de/downloads/xawexepurudipidoxetesew.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/8ef16e6534a986efd893338427ff5154/mugifotefuberu.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/8q02cqe9596ecn4td3epp6tpd5/xoxapij.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b1e203ae4---kufisuwozakokip.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/79459263763.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/gosumegopakizizufojizo.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/qakq56s9mpeu5t09vdutoc7gor/xagubakerumekefufi.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///fabatixexagig.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210629050241.pdfIn PDF document text
    • http://agavietnam.com/img/files/rovadirepojevi.pdfIn PDF document text
    • http://web68s.com/upload/files/bapozaduvijux.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ef14bdcc52e8a942925f2fdfd65dc3c9/pipisukaravugigu.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/e7495378b278dc5153b8fb0c42982245/62056655058.pdfIn PDF document text
    • http://ortetel.de/kunden/schurig/ckfinder/userfiles/files/wulubutuloxasedubase.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b349a06c066---92419797986.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/v6tt5kfq4oq1dui1l38fbth6ug/85258942876.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/97c5020fc22c5b7912d7ae0f2ad2da11/luxejukuwijuwedamunono.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_off0001168b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA2 10124 bytes
SHA-256: 914937a2deb0b4c6e09fc93045e4774462bc3da4d329714d9d6ea95ac11611ee
font_02_sfnt_off00014525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14525 17800 bytes
SHA-256: ce9202bcf10064524aeb2be0eab8e7f09b8c26e2220be8ff33946e9edd79427a