Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0055e99c473c36…

MALICIOUS

PDF

70.5 KB Created: 2021-10-01 00:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa4e55dcf959d481445fa4e2314f9de0 SHA-1: 4c64aaf9900352a1d03e69c78fda3b6770a6f67b SHA-256: bc0055e99c473c3641634cc56cc33abe4759bd6a6217ffe928ebf5953b731807
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://vgi-vn.vn/app/webroot/img/files/jipasiwebereba.pdf In PDF document text
    • http://d-a-s.cn/userfiles/file/xusivumozonesajaresexo.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdc940dbc6---mufobekukikelazumuv.pdfIn PDF document text
    • https://curvy.tw/upload/files/poxelavija.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/8296445769.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fcde3e064---vobonefuguwitizodexedine.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/zimejuso.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/59661126859.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe42d7b986---18507198828.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a97d5c30a---kekonenomakikis.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/25659002721.pdfIn PDF document text
    • http://tencanpowder.com/d/files/valususedopodumitupafogej.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408cceb2bf7---lefitoneboniludufadutiw.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/58921307298.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/49344350965.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/8777380035.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/pavimawejuzoxewar.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/vidaza.pdfIn PDF document text
    • https://envirotechindia.net/admin/userfiles/file/tusofadasojalin.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/36244861619.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/duxulujiwafadefunuda.pdfIn PDF document text
    • https://birotex.rs/images/files/bujawunawabago.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/rikowazigomigavujawuvoga.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16136956d7b86f---rivinezowalurelutav.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/mesepajonepe.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/veromarabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=toca+builders+apkPDF 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_off0000b5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A8 15396 bytes
SHA-256: bbe72cde2fa688c14cdc22e72be717fcf595b1214df183a5d4f8b6571d617d67
font_01_sfnt_off0000dc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1D 10600 bytes
SHA-256: 97c2791b89884e66b2c5c409f33844904f8947bfd4f83371ec7dbb3304ac8755
font_02_sfnt_off0000f432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.