Malicious PDF — malware analysis report

Static analysis result for SHA-256 e32a51d5b546b83b…

MALICIOUS

PDF

86.6 KB Created: 2021-09-07 16:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5e3dea80ba14ac1f951ae06c4c0810d9 SHA-1: 903babe1be71581f6847b2878e2f633e1cf07004 SHA-256: e32a51d5b546b83b86ddacbca558e6e3a8b57e6ac099e07710d513759e149aa5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=havana+cuba+map+pdf PDF link annotation
    • https://mannoorpally.com/uploads/file/pulibadixuxuzegon.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/69af05b1bf744a7a55a50a7c1b24cb4b/19430872127.pdfIn PDF document text
    • http://0851gay.org/userfiles/202107file/2021073119412570554.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/giluz.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/c520cc15b3a085b2fe4744a85d255524/xexomazakagosediw.pdfIn PDF document text
    • https://nic-n-nate.com/files/files/85636787763.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/risuwawodofedixowobitini.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/41f575curh82dmc95n42d7nq15/nenolariropemazenovetel.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/ad4db81528c0b0dd20208ea7e541d6cc/nukuvafuvugedusirute.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b15c7418ea8---kubewaboxeragejaki.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102cea81843c---ligewoliwitakipofa.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bea8876dc---64851493345.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/funalike.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mtdbnq8gulth19t3truf4bio68/32611591887.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/jofipadakutepiwinetelafa.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/31733378494.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/dadanuderasupotofujidugi.pdfIn PDF document text
    • http://newcastlehigh1967-50threunion.com/clients/43248/File/nafexupegominozatilodi.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607086a5aece0---55829115720.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/13962716142.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/99213421331.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bebbeb45fc5---kuwesabizajogob.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/47096775243.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_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 18520 bytes
SHA-256: d164da975a9698f81658b71d8a4bd973c82d81c2e559bb99ee41046309cb4821
font_01_sfnt_off00011df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13607 10320 bytes
SHA-256: de352987cf3162c747735e90d861d03ce30abe0f853969ddb63fe1aeeb510643

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