Malicious PDF — malware analysis report

Static analysis result for SHA-256 217893ca728d3f12…

MALICIOUS

PDF

79.8 KB Created: 2021-07-19 00:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 69b1ffbf83de1471a2fcbcdb41287985 SHA-1: b6eb62b2487f9ed7dbdf56e74e92b7555b1b2788 SHA-256: 217893ca728d3f1252ed42dcba29627d40b70c442dd6bde27c33117c087d2f6e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://agataklimowska.pl/userfiles/file/jatifemewakad.pdf In PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfb7850052---27218014173.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/acb46af6e817b93ca35e04de0475c5d4/jixumidevuk.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/kegujazuvewevaximosabube.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160822aa0dddc9---pipebutefafosirez.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/kaxumososed.pdfIn PDF document text
    • http://www.bandungmesin.com/file/mawinapenenunutuf.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/6464138508.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/17304839639.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/jp8dnsmtgg7uggu13gafusrb66/judomizim.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/zominaw.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///79917485492.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/13075992382.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c378c23ef48---76993135644.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f734c1b19---86302083987.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/raregoji.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/meselefediravu.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/piserov.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b9efac7b5---45934257706.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/5ab9ceff31b5ffc72b073b3c6dff79ac/38625595701.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/siwemesupex.pdfIn PDF document text
    • https://jambukuning.com/contents//files/84799387297.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/d1d4d760a57331dae4193fb2f11136e8/pibijoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=printable+english+grammar+exercises+with+answers+pdfPDF 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_off0000d403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD403 16704 bytes
SHA-256: bf91b253a5683d632a090e2610799fc7d7201442d3c83709af38529b141020cc
font_01_sfnt_off0000ff87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF87 11276 bytes
SHA-256: f57875ba58c9c95c358d85f838fbfd0d0ab97e850691e076c8dc3f61c9b0fd25
font_02_sfnt_off00011973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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