Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a27c6ad4b0ef8d…

MALICIOUS

PDF

85.3 KB Created: 2021-07-21 12:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0cf23f48ab49b4cd749f3f63610ebd16 SHA-1: 278c6152bced20148d0a5a2aef9f66f424103a52 SHA-256: 50a27c6ad4b0ef8dd4c6b5757ff2c975499541d3e4eef2fb19168fbceeaec064
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://x-site.by/upload/editor/files/35144169184.pdf In PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf70d22e80---33693757290.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/jenanezago.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/tolotufujofiv.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/11672296553.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e2f4c83f3d6---dogiwobavidote.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/73484749863.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078756f8c8de---47764796017.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/60b8e15962e82e774c05f1ddf66515e6/82279185631.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/od166tltful7vaultrjbh4p8tl/99979263880.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/f2caba54fbc683d427b38fc1133238c8/dulivefuzi.pdfIn PDF document text
    • https://csodamalom.hu/files/files/zukeger.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/fuwivalabevef.pdfIn PDF document text
    • http://vicorsupply.com/uploads/images//files/50121293537.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/katogoganebazabepo.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/60042075100.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/92084958381.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/kmt1oo81j088v0sbg4euel37v6/ruzukegopusiditetel.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/91019136210.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b20c1343fd---55019209571.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16078f1d4c2a03---1283160478.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/94760130254.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/63579414404.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/96652156080.pdfIn PDF document text
    • http://championsview.net/userimages/84623883299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pokemon+go+free+spoofer+androidPDF 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_off0000e9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F2 16788 bytes
SHA-256: f3d83b77570b223921ac490d17ac68bc4886c12b6819b032fe73d501f4e7a9aa
font_01_sfnt_off00011554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11554 10792 bytes
SHA-256: bf85703775ca2e7aad9d6a07045350394158b3a6dc443b984663a24c31139185
font_02_sfnt_off00012df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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