Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b33b4fea347545b…

MALICIOUS

PDF

105.1 KB Created: 2021-08-30 17:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3343d677e619c841b422c3b8e80a5421 SHA-1: cf517ba7e48c3e4824c89acdc8bb023abb4271a1 SHA-256: 2b33b4fea347545bff4103016c34f247d38b18247cf980b45735a16c36112142
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=polynomial+in+standard+form+solver PDF link annotation
    • http://akgwealthplanner.com/crm/files/jezanolefalawaloxutu.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/79460154627.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a5682462c3---64149312097.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1625231694.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/sekadilevegebakipideg.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8beed98b8f---joserifonedif.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/85d27328d173986d19cab89b38d24a49/zesotuwididaxufajudu.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/93931768996.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/pajuj.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021072916491889.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/butijo.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a286e3a482f---xinapufewowimem.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb6e9a4ee5---10199581010.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/sesukeg.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/24369049956.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/vexex.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/324994712.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/93336861919.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/zokopukepe.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082816d0a938---83532762057.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/68254676924.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b6604fd46---58208598252.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/8rmoptbgvqme5bas76mr43j3a0/mozufinixategatedaniloxo.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/lasijidur.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/k6rbaua8ckgfk5659rg513okf6/2883247637.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/zivoges.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/zabiwasaludonokijajevide.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_off00012d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D23 20644 bytes
SHA-256: 171ae9fcbea5565b210ed58705b544ee892f90d2b8b3092b193d74c748cd1d9e
font_01_sfnt_off00016325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B3C 10696 bytes
SHA-256: 299b8b31f8189162d843d99662a2d218bd26d333f22e1b60b21d370b4e1c1ddf

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