Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbf54ec750f10da…

MALICIOUS

PDF

235.8 KB Created: 2021-06-26 13:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2dd3a621a1056d2674162923c6c50f71 SHA-1: fc4c3a78f5c20b78cbb0a0efe97217a765ee9054 SHA-256: efbf54ec750f10dae3fca08642519112d27313ac7c3760f2472961afd060bf2e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, utilizing a link farm and SEO redirector to disguise malicious links. The high-confidence ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous embedded URLs pointing to compromised WordPress sites suggest an attempt to deliver a secondary payload or phish user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9777

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c043bba27a---zopemawevu.pdf In PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160adcd7f4aa80---dupodegalekajerut.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/lugixetudipaxo.pdfIn PDF document text
    • http://yilip.net/userData/board/file/palipitel.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/aat6k8p7luv139vabj6k5lig9f/gegifogenujazad.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/57248246991.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3b20b6b82---36944242413.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866687074d4---fasexojejodogi.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/jajowep.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/0e984b38d7ccf25891b1e3db224b5b82/nosavijovasod.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942de0b39e9---lixazedegepe.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/fafeka.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/lanarafozavegatok.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/iqa2h47akfmup9kfq9rfeetcnu/75637760508.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d881a0bea942d36e99efcbcd65b88871/totikagawimeguki.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/g15vri0re5tpd524chb6uonp0n/dokebipegogonilabepor.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec34e6af6a---gegugevasozile.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcd29a1d6d---nepunugejasapexuwap.pdfIn PDF document text
    • https://ms02bet.com/contents//files/papabojerabi.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/navalipepamu.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/bfd4cb77ffca44ab5c688c898250faa6/mobiwazu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b817f8ec770---90442980423.pdfIn PDF document text
    • http://songiadabinhphuoc.com/upload/ck/files/44245131356.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/33d75b83e495df76e333b7388f203e89/nivimavimexufok.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/53399379636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=early+steam+locomotivesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000318f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x318F6 7796 bytes
SHA-256: 23463f918f9daad0e25ca9a9421f6b435d630a473d0dae08ac52abbb48886a19
font_01_sfnt_off00033416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33416 10448 bytes
SHA-256: b4e6633aa8aa304f2917e0f40dc6caec31e0247a2126ea28ac36ee2199f82935
font_02_sfnt_off00034be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34BE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000363f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x363F2 25048 bytes
SHA-256: 60541864b50215855aa38cc2f7a5c85801c6f552b25a81162c7be5ed52678fa2