Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee73449e40e315f8…

MALICIOUS

PDF

85.8 KB Created: 2021-08-21 13:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c992c79cff891ff76dd58e5cafb58a57 SHA-1: fa1b88c7a19faf786f3005de2b6c372342da8cd6 SHA-256: ee73449e40e315f8a51e6c15fb0c6d6f139d3f336de0468b5498cf52b5d509ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious. It contains multiple links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content or facilitate phishing. The presence of these links suggests an attempt to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071544268b1a---tudilefugawu.pdf In PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c831bb2f0---zamivufekoxatoni.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/jajodat.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/voluvazorom.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fe6769e30---domitemusiwojanatoves.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a204151224f---xevepet.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/6204917718.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/dc4bb9106bae29e09a13731a756f0a70/zasalufapofo.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/76424462229.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/lowulimifufodoxopijibigu.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/musuxadi.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/jovedol.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093cd335e353---jozazagiviwa.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/rubititepigita.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/vefogevagotovupetupi.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/21158962639.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/65647633021.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/jofegedakado.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/b00f6eb6ae80c6ed0ef2c9563bfb5097/88516356681.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/83275530955.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbbee29542a---ladajuziwosazubuzexiw.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/kuzotitojukazelofaf.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/63871724926.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb24d464a6---1922651625.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/79077881189.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814054b34dc---74417606162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tcl+65-inch+c715+4k+qled+smart+tv+specsPDF 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_off0000e92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92D 11440 bytes
SHA-256: c3769aeb480efa411b6bf8c83c0d10e44c661a3e5460ab9490290c7366f6485b
font_01_sfnt_off000103f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F9 17164 bytes
SHA-256: d8c0a351f019dfed69295a2124d62812fe66885c4310d3f9a8289f894d5b550e
font_02_sfnt_off000130e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1