Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db55e3dc372c905…

MALICIOUS

PDF

85.4 KB Created: 2021-09-24 09:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 008ffe7cd574446edb28de5e99061686 SHA-1: 5701ff760ce9f3a1677eab445e7e4e8a84e52bb5 SHA-256: 0db55e3dc372c905d8d175ecf6c8be78f3587e1a31884990c734560e5f6b5a59
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 WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://vanprodukt.cz/UserFiles/File/dasumuwesele.pdf In PDF document text
    • https://adci.vn/data/upload/file/savofelilovinenogikop.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ae4e1be15c60f52149736a92a28fb742/tovasupinaris.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f790a258a55548ac69e428bce259c9bb/nonitem.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614687d04a01d---fumubetijagakewe.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ee4e6ca61---70830274900.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/dunaxos.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/8303409532.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133232ea8944---dizawig.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/wobuvilasopefadezif.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/nufaponevejovujuguse.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/71964413355.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/54211253266.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/76034160448.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/rugidikezolaginevuvafoziw.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/rebugusupezakujupalebelef.pdfIn PDF document text
    • https://wonkingchina.com/d/files/16325932842.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/97475851040.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7301d9dcdaae5a3f2e25e6cc22274952/xudesomipigigususinir.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/tiladusavejazura.pdfIn PDF document text
    • https://kvzriu.org/images/file/44829190952.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/zizubakizugitoj.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613731ccd87a5---42480782981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=body+parts+movie+1991PDF 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_off0000e7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCC 10856 bytes
SHA-256: 32c64d0f77851ccf9452b12cecb84e3abb704e48e9d5b53b8e2f34bff69f8de8
font_02_sfnt_off0001190e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190E 18008 bytes
SHA-256: 628857fe4b3f1078a20ed4fac7088b939104d550954233fe986676bf324dd9a2

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