Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f1834ed69c2b96…

MALICIOUS

PDF

95.8 KB Created: 2021-08-14 13:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 39eec21177f4081924eadb4299b21986 SHA-1: a7ea557c91529dc1cc3ad223389ec1849a94287d SHA-256: 59f1834ed69c2b96d74ccb9ba01483cd628dcbcd5e063eac6f42877005067a55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://infrive.ru/uplcv?utm_term=ds+emulator+unblocked+online PDF link annotation
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/mutexuwego.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/62643881893.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/fc665c174b7d286011b5af8db8d983f4/sobusoja.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/xesebevudikebetorofewob.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/kotukavopinoboxar.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/ab3f230186f7e0401b26f02158a70d5e/36929171251.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3fc73d982---fodepuwizoto.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/peketosi.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0a0b83fc8---99015467605.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/moduxarorareratasu.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec58099ee6---neravisefudojujalilawiju.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/48db2b032a0d0d9cab16e28bef20e2fe/35068059088.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/31550277279.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/nerifowawev.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1ch1gthautpo7oid2tc39790s4/28376795145.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/hup1uoamb6pqp703dp1tva1duf/foxumuzubamegunalidemu.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160f3a61de03b3---55805791110.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/opbebpcd1939dgl65gkaosd3r0/11160897286.pdfIn PDF document text
    • http://gabortech.com/admin/file/bufipixufodog.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210701_224536.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/f77a0d191e4f68ad34021037d5f2fbc8/basetiguvawi.pdfIn PDF document text
    • http://ausafe.net/images/art/files/99874054865.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/bd7db8a0aaed3efdc2224f949cec1068/18789219693.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705a674b293---848834361.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 10864 bytes
SHA-256: 83981435828d3b3a8f6cb12098e5771505c56f0cce7b7d69903baa6c7459d919
font_01_sfnt_off00011435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11435 16348 bytes
SHA-256: fdc3f250e16d4eeaac0151c08e1678493ac6cc67090af3137bc700c4cd553891
font_02_sfnt_off00012a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001429e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1429E 17228 bytes
SHA-256: 8902a6d0f5294bbce0028a8837fae3a324e5d08ce3c154154436b6a9afcf64c1

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