Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ef262a5086257a…

MALICIOUS

PDF

76.9 KB Created: 2021-09-06 02:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cb3d4df4012a0b1e6cd981890b8eef89 SHA-1: c0d33caf78a5b3456be9c8d0cf50f55a81f8454d SHA-256: 67ef262a5086257a182849331f85ede38c7003f5d5d6c37daf1bb8ca7207b154
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chcial.ru/uplcv?utm_term=london+attractions+map+with+tube+stations+pdf PDF link annotation
    • http://stadion-zarya.ru/ckfinder/userfiles/files/xovosanenup.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/61hnah9vper25m35brk6adrdpk/29969239862.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/xudukujopimafabetuwusu.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/95fd0280b3d57f9dfdb02b5a2cb53814/92829422041.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b597ee6f182---18408747898.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/sawotirekitoma.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/gaziralun.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/wenuweborovo.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210530121947434893fhaobf.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/56558283077.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/30135056436.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/reveperodo.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/37243642959.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/fefuzevilixegipitikob.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d221130ad9---gupiragiziwanezuna.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/mejumojubodefajogifajifu.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/larituwogurugo.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/19901680263.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210630_B448BC6D2F2C9EDD.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/luturogi.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/62286581075.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/gixotepom.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/tunapelelagaxirozavojux.pdfIn PDF document text
    • 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_off0000c4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BC 17512 bytes
SHA-256: 3be9aba8b161db5a8c175035b393fb01e0aac74241ef4d82c18ff12d1246ec54
font_01_sfnt_off0000f26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26E 11124 bytes
SHA-256: 64e9f4242f82817b4a59e0c2e92d484a11d73ff0e2d686e3b63f37551f40bc71
font_02_sfnt_off00010c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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