Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdfe58bf763f190c…

MALICIOUS

PDF

89.9 KB Created: 2021-06-28 06:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74ce27cf2914d2eb8faf2c1eaabe6c84 SHA-1: 859cf51d80ace6e34a2132f6035463563a3f7f9b SHA-256: fdfe58bf763f190cba60b0220fe9f87d48a22bdf8205b922ab809c9c9afd2750
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as link farms on disposable or potentially compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://tidaksusah.com/contents//files/mifetozukopifot.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b84d311e8b---keleragolumatavixan.pdf
    • http://www.biotanika.pl/upload/file/jolom.pdf
    • http://smn69.com/clients/866038/File/tunudodevikowajo.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8526862fb---wovumemipikazivutiluzi.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/96e3a2f014d2684075cde9493fd13f91/52671825215.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/gisom.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/ba74324ead69c35ffdb448763d9c4f62/39736481881.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861cf924b47---debizojaxelapamolaxiwejam.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/353dc99f7ea7858dbc819b5a8be0f309/wojaxemidibiliki.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aca096cc350---tuzofawipedu.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9f5c008e7---2300952559.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/zixenupasozegisivakiribo.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd8bb60538---wepaxuloxibidotopef.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3db7f2b8a---nabifuzejasomefososorex.pdf
    • https://ibeguiristain.com/userfiles/files/38625928880.pdf
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/60877108942.pdf
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/65746449793.pdf
    • http://bong-dem-long.org/upload/editor/files/52387753322.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/5tqu3dtakflqeqpn6v4he6n1r6/tagosinaku.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776d7ab9b45---88190145406.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/b0dcfa861a1a10205e375d3d604d29a2/35728292076.pdf
    • http://eros-arena.de/eros/userfiles/file/39601825968.pdf
    • http://goref.ru/files/file/79341740005.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817f5d66166---rimokaf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=kale+bad+for+you
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcab.bin
1a3a7c9a67e676fe81f0201aff27b963a20976d9f3adc9094696a1b6404783a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAB 17828 bytes
font_01_sfnt_off00012b7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7E 16792 bytes
font_02_sfnt_off00014395.bin
89b92d5b75fe42d299798d1de0cb02f60aa3d3a8bc03fce0e86ce1572ec9d932		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14395 10228 bytes

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