Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72f0e6e981a9edb…

MALICIOUS

PDF

72.2 KB Created: 2021-09-05 04:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 90bcdc1944f18c491a66f0062363cbcd SHA-1: 5e69e426c6b1ce797275d16e349f9dcc4c387ded SHA-256: c72f0e6e981a9edbbbea1628709d0e879e95b0710859bde6796dc0b15af94aa2
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress upload directories and other potentially disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/b2561183179df64bb6b6b07d815207e0/zawetajufirenajavi.pdf In PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160991f5bbb60e---58198671946.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d67d6ba2ed5---46288683813.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/0svqljq125lk094mukc6q5a2v3/97694455568.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0092c70f66---80940885768.pdfIn PDF document text
    • https://comfort8889.com/upload/files/87161136616.pdfIn PDF document text
    • http://orem.mn/uploads/files/31499216165.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/a6a3c8f8a1a4c5091008f6eb2d963fc4/59190216088.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/81726361088.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///mobug.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/77234778594.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/36d1147d45b3b2a44e5e8b26a544b862/99425399488.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/7qco0ud1afjob2609mdad08m41/sajinutepuroxirenupejuduk.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609908f43ed73---tevuxikizevuwovuranetijux.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19a52885dc.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/pakokoko.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/tugilazujipipefo.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/8leg4f8ccias7v1dsbglhvpu6j/refijowojowuduludazo.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/22868795674.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/c89597016f77df897f3cfb72274fd898/43473384002.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/84853786447.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/jki1a036k2v0bhjgfemu6q5ieo/pojadimubuxakivo.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/56254659088.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/wugopiginusakijamodoxare.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/mixigut.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/0dm0p3c81qoljapre7serp8qg6/3710821368.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/rapijegutikagelevekep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=mixed+second+and+third+conditionals+exercises+pdfPDF 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_off0000ba3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3C 15328 bytes
SHA-256: 8f7d60ae9092b8bcd7511660228326f8a4553b21f47d210dabb77363eacea45e
font_01_sfnt_off0000e10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF925 10812 bytes
SHA-256: 1aa82e1ced82fd4e9e6227c035913a4a259395b6551d2de2fdf1210e1c93f1cf

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