Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e16bd0fa8aaffa8…

MALICIOUS

PDF

87.2 KB Created: 2021-09-13 14:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 96675a9040bf5d1f2147a74aea18e0fc SHA-1: dde094528225daa85d2c650edbf6f8c8dea84946 SHA-256: 9e16bd0fa8aaffa8ad1ea554c1ae843e758f733a2bd119e74bea5c8785de7866
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, with ClamAV identifying it as Pdf.Phishing.Trojan. Heuristic analysis indicates the document functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple links, including those on compromised CMS uploads, suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.utn.ac.cr/sites/default/files/files/mufulexutimafu.pdf In PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/labitotijo.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/61612857779.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e001bd5cde---1400742394.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/zevudolofilorir.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/noruzubezesaludigawaz.pdfIn PDF document text
    • http://word.mn/uploads/assets/91352117977.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109022248327224.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319540864c1---tawatuxaloxexezivube.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/tejixedagise.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/nerotixajaselepogutaxire.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/ranazefakedasa.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/sugifop.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/mosilupuwasow.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc4b948952---77634138275.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/26026331133.pdfIn PDF document text
    • http://findusafranchise.com/files/files/nokopegidotofurepoto.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/towewesurejut.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/rasedanozivozasomipojus.pdfIn PDF document text
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/97051667962.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edfb770904---mujezasem.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/8878885744.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/mezuxugoxumu.pdfIn PDF document text
    • http://slovoveri.org/userfiles/25828918830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=best+android+ui+design+tutorialPDF 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_off0000ede6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 19148 bytes
SHA-256: 1580dd66719f659dc6f25806de6e828d7a4993115bceb03361c16d84950019f3
font_01_sfnt_off00011f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F96 10576 bytes
SHA-256: 5c1169ca7fc169ba827828e329382332a655af45d123ecc022210f2f229f3772
font_02_sfnt_off000137a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1