Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b896c83356b761a…

MALICIOUS

PDF

91.5 KB Created: 2021-08-05 02:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d2a1434696243b4be0a5c902ed676744 SHA-1: f1ab2191f3f2e3684900393193826fba01302216 SHA-256: 9b896c83356b761a7f99e95b8cdeb5b642da8b1fec4ebb147a2aba5b56e33b77
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or redirection campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL findings are sufficient to classify this as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://polkovnik.su/upload/file/finatutavonomosit.pdf In PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc66eba18c---38260099640.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160899eb290e76---dekaxixinefafokipivibuk.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/53688241361.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad05256b67---39158251152.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210626151405.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/37020347295.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/21434560796.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/18433228514.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/3170c189f5f30e1251b0dc3d54de1e21/mogepon.pdfIn PDF document text
    • http://jarosi.hu/files/file/zuzesekanes.pdfIn PDF document text
    • https://tsolisp.com/files/file/lezugezenedujemover.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/rabubagi.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798349895bc---37230373444.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9946dc2b35---bipad.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/pesumibemoferab.pdfIn PDF document text
    • http://aven.su/userfiles/file/wizofumitawu.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/danukejobopujal.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/37975698704.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/k8kcanfcg6beknb4a1ot07n39e/galanoxovoziwaru.pdfIn PDF document text
    • http://srhs1980.com/clients/877094/File/27351410996.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/71301065935.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a83c383a1---72564590689.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee7c112c50---kodovuwaditejofezozoxe.pdfIn PDF document text
    • https://bauarch.bg/files/lasodefap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=we+bare+bears+font+style+free+downloadPDF 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_off0001006c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006C 17800 bytes
SHA-256: 5e712bde55d2d00432f9fe8f11fd8faea0cf853a06717343fb3416da4098d823
font_01_sfnt_off00012f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001477a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477A 10588 bytes
SHA-256: 5c646261e8ab1fa2dd1ccdc5601de93d3e8a2523ef9665d4d7fe80b9af05a477

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