Malicious PDF — malware analysis report

Static analysis result for SHA-256 4571c79834b18759…

MALICIOUS

PDF

77.8 KB Created: 2021-08-13 18:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ee36e761db22cbe43802fe240949210 SHA-1: 4446708f33c893617926d09f2f103793d27e7c54 SHA-256: 4571c79834b1875998d623e26d325c988fcb537366f1bd0bd0d235fa77dc9acb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/uplcv?utm_term=classifying+simple+machines+worksheet+answers PDF link annotation
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/f3d4b9abce467a41c289a0b9e95141a7/tivaz.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774a62bb9a4---ninolilagu.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160800d7cf1b1f---42877701681.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/45964704772.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4094191f0---dolutakibafijekunifibu.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/23592e98d84a29307516b8ce019e14be/tutek.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/38623940987.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/36762134735.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/78bg93nrglv4huro2ag07frvg1/17341072413.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/faror.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa5b67d808---jomazotewuvola.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210615_62F6055A7298B2ED.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/67135452956.pdfIn PDF document text
    • http://kco.su/userfiles/file/pekovepo.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ba564c54e070bad37f1e1893226d2c07/jomosonatefobuvixekar.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/jitaweliparatokalesumu.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/a0hk581h0erg7qur0f67s1qda1/zipozimegagejomulove.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/wozoj.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7bdaa9c902aaa19d46a69c27e77b19de/69516964342.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/68919081561.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7537ee8b4---4306363073.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/108b33148da5b74587177eea2f6210dc/vijerex.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_off0000ca26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23D 11248 bytes
SHA-256: 2ec63781fb363861cf91b631bd4b062ecfd8f6bf427411ab667455fcfec38b85
font_02_sfnt_off0000fc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7C 16704 bytes
SHA-256: 91f194f57d673c041b32640c5a83a0d24456c59aef07becdf2aea5bb0b22b8b5

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