Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a8ee179f1696ff…

MALICIOUS

PDF

79.1 KB Created: 2021-09-07 21:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 785b4055d39a742abdd6379086995b61 SHA-1: c22973763a92efa7e6d23d8bd74d43f015c70aec SHA-256: c2a8ee179f1696ffc4049ef5996443dfbef1f60580dcf033e7bd0f8737e72a1e
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/50ed500e0c5c46e210766b97089963a0/42679564545.pdf In PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d20cdbf09c3---14266284749.pdfIn PDF document text
    • http://bulmarconsult.com/files/wolebotonegojitowimuzi.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7d4e0aa0---roxiwolasubegug.pdfIn PDF document text
    • https://jagominum.com/contents/files/jerizetafuxeputuxadojejug.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/jopikixarixosu.pdfIn PDF document text
    • https://digireg.sk/upload/jizejotujemesemagarunipid.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/43652976753.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/41510388415.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/raken.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/2023d6e700048f901d98ee965df2ea55/jamazebijun.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4e884c3dd---xokijalojikimonuxomum.pdfIn PDF document text
    • https://blogsma.com/files/50179186961.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/239172bf2c6710dce0de7c8ea806f8da/buxeriwesuvifuledodal.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/mapejofevi.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/3130365862.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210521145722.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/sumuxosifapomuj.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0de4ca0c1---suwuvakanibetepodut.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210727201701.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/fininigiketarafut.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/sanip.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/gajejolafux.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/96189225407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mixing+colors+printable+worksheetPDF 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_off0000d155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD155 17204 bytes
SHA-256: 222a756e34c55f4c5dc0493c3568cda9f57f8030861139a1c006967934162cae
font_01_sfnt_off0000fd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11571 11068 bytes
SHA-256: 5b38a0c3c5fa8927e7e21aca08379467f20d3eaa1cb42588fdc6fadfa36baa5d