Malicious PDF — malware analysis report

Static analysis result for SHA-256 239c4747b2822e47…

MALICIOUS

PDF

87.6 KB Created: 2021-08-26 04:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ec654e98e5d3baef08716fa7eb0b248d SHA-1: 5eff50f6dfa03ac31e96bf38fe2fe83f54831204 SHA-256: 239c4747b2822e47864e6a61c37ad574497e5c6fdd42c584f7d5b050946827a0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs pointing to compromised CMS uploads. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document's purpose appears to be directing users to potentially malicious or phishing websites, disguised as a collection of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://monterroso-construpuntos.com/campannas/file/77788944579.pdf In PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d807fd8659---nubopabesebopojepugedufo.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c0dcf0b7dc---83809281867.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/49f1a6d147607a6bf508192a5970e7d2/84752626579.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/29399379638.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210611131625_nkbu2g.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cd675ba66---jemular.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160769796529dd---58966402121.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44b3e8d2a8---47365175239.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/76442754267.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/wapokaxag.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/buzogegafumoviredosudir.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/20210052727.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/bbi2019tddudgo2dap241c6hqc/bunasugukepujudozop.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/93433439518.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e97586f661---85381428668.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/pedatelojazugasuregaw.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/23009802555.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2d935d968---visowomoxubedovukor.pdfIn PDF document text
    • https://amblamy.ee/upload/file/60288161458.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3aa508347---57858115414.pdfIn PDF document text
    • http://fxmeat.com/upload/file/90454622eea76d2663b5b7b017729146.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fdcea2059---lotiji.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/166394d4a5a79a49b7e5326fdf74c3db/wetarebokosatirakekojote.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81bdcf1eed---88573366879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=minecraft+how+many+bookshelves+for+max+enchantmentPDF 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_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 17536 bytes
SHA-256: c1bf10dd460f94f402b98425acee8b3731732080155217ebfa7799320bcaf120
font_01_sfnt_off00011d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13537 11196 bytes
SHA-256: 2b81cc71c147a78c83dae25d77f60654d845a1738c244f6335d5ab09f4fbf0f2