Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be0455ff50ac0b4…

MALICIOUS

PDF

72.3 KB Created: 2021-09-28 04:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b6666be29c0b2f8d465ab11bd4b78519 SHA-1: ae62265563ab80066c410b3caa10abbb71a78089 SHA-256: 6be0455ff50ac0b4793d1646f151390c28995e450c111eb3c3669097d8ee78c3
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, 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 0.9971

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 https://philabc.ru/uplcv?utm_term=ultimate+car+driving+mod+apk+download PDF link annotation
    • http://gevenschoenen.nl/ckfinder/userfiles/files/daxinuwizos.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/tufaxupupixofelizulobud.pdfIn PDF document text
    • https://hoppe.dk/files/3126851018.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/9748399046.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/e083c95e257749b104c3df234942235b/80808678021.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9024ab616---76022927949.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/75851410416.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/18363261537.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/lewerovefoxanelubo.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6ac3eb8f4---potikif.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/zajajogida.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/wulalojubokufujovumizuvet.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/zarubaruwixuvibavuve.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/56506909861.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/fazaxuwilasaruwanopizibos.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/doketopopitizag.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/ruruz.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/kumividafumubinebux.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/tebofidojoxuduxelusa.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/56046220156.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/93726536830.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_off0000b1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BD 19316 bytes
SHA-256: 9017f39baa68c1d2aeeb8eec8ba3b36f30db4f5e00886f2ecd245e7bb3daf76a
font_01_sfnt_off0000e2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 10940 bytes
SHA-256: 1a1aadcbb932e5352ba707158f1b70cede8cbe858b1edcd738b9dfc1dc5fd96c
font_02_sfnt_off0000fbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1