Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c4b36d9f007d2d…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 08:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 09f14a27d0b679bbae2c6a52a7b04ab1 SHA-1: 49e6b71c15c198622a0c1407b1e03188cecebe22 SHA-256: 66c4b36d9f007d2dd2e965124035e43775f4125aaa47b448986fca3b77835219
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f26db3653---tulavimumupasolasedibepi.pdf In PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f01392975a---vozuwuxatazopimudim.pdfIn PDF document text
    • http://recrute.fr/files/files/rirukilesobopuk.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071eb06a78b7---mumexozebedejewi.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/43096b3ec3d42bd38e422dad1dd2b02d/fixipetikamerapovusa.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/b1b0aumnom2n7i1m8rht7eibv3/39029841668.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/tedepuzogok.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/43356419982.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/wepaxawosefodivis.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/41650755805.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/sebitejijudutaj.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/61851638554.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/foxumojutugafubu.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/48409506731.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd9da4e23---36024218808.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/96183876910.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a43978f127d48f6bbff58275a54dccc4/99834970812.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/76776419960.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160abcb12090b0---nupimekopazajajexuvig.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-6/20210506032910297319.pdfIn PDF document text
    • https://basisangka.com/contents/files/gizegijavikiwowa.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/nuvedomu.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/44f7776edeebbf70d1c66068f8205e28/zadilapadipuworag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=oh+walking+lungesPDF 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_off0000e46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46E 10372 bytes
SHA-256: 8449c9d500b040efe4ffdcde2cf0352929c4d2c4679c9b73d504e7f93c808b33
font_01_sfnt_off0000fbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF0 18512 bytes
SHA-256: 7d542134d3af71e6d2e9efe7ee4992f2305e7e88cb88a333d953d49f4f7d4876
font_02_sfnt_off00012b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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