Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8d1b4da6564c8d…

MALICIOUS

PDF

68.8 KB Created: 2021-09-07 09:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1108ee4759e6c341a73cc85e9b08426b SHA-1: ab2669ebc279cd58fde185d96b439c1ee1c7d747 SHA-256: 4c8d1b4da6564c8df4dccc5b3bc041cdc11090da4f714d56dcde029679eda885
176 Risk Score

Malware Insights

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

The PDF is identified as an image-only lure, typical for phishing campaigns, with multiple heuristics indicating it's a link farm hosted on compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload via the embedded links. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the overall structure and heuristic firings point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://marcth.pl/media/fck/file/monejiwufa.pdf In PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/mebuwoxugolinukewafon.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a78a10281952bf4d93545a02fce14a5a/48415436866.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f31b5bbc8---garesanolopasiwaredofulop.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf284a000c---45273583378.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608536537748d---fujodiv.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/39534aad723ce6de2cd302117024865d/dijibuzefizemamapuzew.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/fezalaguruketo.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/67505336793.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/4941481349.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/31907622912.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/dmcd1ur9lhntdnl05ra003bkal/borulokupeverina.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/medenakedinetojoxag.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c077c210ee8---24390422859.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/8kpk5usklhenrsjk98tb1d0hmn/dufanukigawu.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10bd35d2f---25249023460.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/49536776820.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/gugonogidapopi.pdfIn PDF document text
    • http://contextuae.com/resimler/files/bomutizivoketanakaze.pdfIn PDF document text
    • http://llux.vn/uploads/files/mubigudepafo.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160becd7e7f9c2---41353488190.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/2m5gflplslbjqildc31qrmsn20/20622839427.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/67739418843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=scholarship+award+letter+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_off0000b288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB288 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9F 10772 bytes
SHA-256: 188eb93ed05b1e0013fd11f896fad7a566f128ab9b302933f78f9cd2a9c255eb
font_02_sfnt_off0000e39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39D 13904 bytes
SHA-256: f1e655ee72d9b0f4fe4f47ad7bf23d4cbefbc40b76ab314b087739c04bf8290e

Open this report in the interactive analyzer, or submit your own file for analysis.