Malicious PDF — malware analysis report

Static analysis result for SHA-256 78782fb490823fa6…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 02:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 620782015a4dd8a78ffce7c37ec9f65a SHA-1: fcd1a2fe83fb447bcc6546bc12cba0e48c5dfb2b SHA-256: 78782fb490823fa6342838942930f857593644c771feb42a977a077df37e75fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of many unknown URLs indicate a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the links and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://aarogyamedico.com/userfiles/file/43485894861.pdf In PDF document text
    • https://mccartha-cobb.com/userfiles/files/18517648585.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/wagedunaxuvu.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/4ee5b16b4b2a97bf927d48ef90b28ca5/buvarisazi.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/38367163928.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/vazumojiba.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/tedipekepesakofowageno.pdfIn PDF document text
    • http://cathayred-csr.com/img-cathay/files/dowodasol.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/mosagawave.pdfIn PDF document text
    • https://12tiga.com/contents//files/94136260952.pdfIn PDF document text
    • http://imaginove.eu/data/Files/fodusanomuzavisimetolig.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/48814323535.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/84166319761.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609242e4d8826---77852670171.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/88513583305.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/ti6p52vglv4gpv92appnbofj57/32463563775.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946dfc02f26---44111156857.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/18940708635.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85661629631.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/e8c15ba8212f730a21d788e59da4449a/xosobugufinivip.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/fenus.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/63427570186.pdfIn PDF document text
    • http://gibson100.com/clients/870224/File/vedob.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/1907547531.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bbe5135e0---34534137012.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0fcd43f7c---41940484898.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160706ed3edc0a---sapotozasilenotuwiwudufak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=file+to+pdf+online+converterPDF 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_off0000e05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86D 17124 bytes
SHA-256: 96257102ca9b61b62314fe3525eb749be76a3ecfb1ac725553f39bfb8c5776c7
font_02_sfnt_off000124dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DD 10324 bytes
SHA-256: 23201cd6560de5c1f55d45ccc8d534b8dbb81920beed446f2f607cc8b2e01b83

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