Malicious PDF — malware analysis report

Static analysis result for SHA-256 df623a5e96244428…

MALICIOUS

PDF

78.7 KB Created: 2021-08-14 01:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e09c531e82217a618674cdabd81ba693 SHA-1: da8f811220d655fe8da12c15e435aa0e3fdc175f SHA-256: df623a5e9624442867a8be3434d1f78dbc79d317c79d6fb3f3d7c6f51673fca3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://giustizianuova.it/userfiles/file/givujesegulokidefogado.pdf In PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/kuzitilekewamelidixexaf.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16265156103376.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885122cca2d---poposivasupiwiful.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160db786d26b25---57441359958.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/b8b2901f14338f33dfa1e16a6fa3fc5b/lokaseporevax.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/belovabuxufiwosazebera.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b8a469953---lunukuvazuxelakavinilezo.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1d6a1f9f1---vonetarerak.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/vojamiximumelil.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15c2506356---pulutegibumok.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/givira.pdfIn PDF document text
    • https://baptistfriends.org/media/zatosiju.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/38616217046.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c342cfdfe18---49727203596.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/gezagafik.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078825ca842d---86588264730.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/46eca4b8bf69427ebb1cec615fa6a53d/34992421968.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/tofepigitenos.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/92936667740.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/basumebimezikopa.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724b86490dc---77345196340.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/zukubeverep.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/62490797310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=direct+and+indirect+object+exercises+with+answers+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_off0000d073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD073 16592 bytes
SHA-256: 37f8fdcae2692ede9d301c267acbeaf0a7fbd8fce1de6e220dc8e18908e3ff49
font_01_sfnt_off0000faeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 11132 bytes
SHA-256: 9f5ec0e31ff97b9244238cd4247fce402c1a8e222e00b73f0a3b605060173954
font_02_sfnt_off000114b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1